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  1. Article ; Online: Plastic bronchitis: Autopsy findings in the sudden death of a healthy pediatric patient with sickle cell disease.

    Saunders, Katherine / Garrett, Erin / Crosby, Ashley / Park, Yara / Kasow, Kimberly / Moylan, Vincent / Thorne, Leigh

    Pediatric blood & cancer

    2022  Volume 69, Issue 8, Page(s) e29584

    MeSH term(s) Anemia, Sickle Cell/complications ; Autopsy ; Bronchitis ; Cause of Death ; Child ; Death, Sudden/etiology ; Humans ; Plastics
    Chemical Substances Plastics
    Language English
    Publishing date 2022-02-07
    Publishing country United States
    Document type Letter
    ZDB-ID 2131448-2
    ISSN 1545-5017 ; 1545-5009
    ISSN (online) 1545-5017
    ISSN 1545-5009
    DOI 10.1002/pbc.29584
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Rapid idiosyncratic mechanisms of clinical resistance to KRAS G12C inhibition.

    Tsai, Yihsuan S / Woodcock, Mark G / Azam, Salma H / Thorne, Leigh B / Kanchi, Krishna L / Parker, Joel S / Vincent, Benjamin G / Pecot, Chad V

    The Journal of clinical investigation

    2022  Volume 132, Issue 4

    Abstract: BACKGROUNDThe KRAS proto-oncogene is among the most frequently mutated genes in cancer, yet for 40 years it remained an elusive therapeutic target. Recently, allosteric inhibitors that covalently bind to KRAS G12C mutations have been approved for use in ... ...

    Abstract BACKGROUNDThe KRAS proto-oncogene is among the most frequently mutated genes in cancer, yet for 40 years it remained an elusive therapeutic target. Recently, allosteric inhibitors that covalently bind to KRAS G12C mutations have been approved for use in lung adenocarcinomas. Although responses are observed, they are often short-lived, thus making in-depth characterization of the mechanisms of resistance of paramount importance.METHODSHere, we present a rapid-autopsy case of a patient who had a KRASG12C-mutant lung adenocarcinoma who initially responded to a KRAS G12C inhibitor but then rapidly developed resistance. Using deep-RNA and whole-exome sequencing comparing pretreatment, posttreatment, and matched normal tissues, we uncover numerous mechanisms of resistance to direct KRAS inhibition.RESULTSIn addition to decreased KRAS G12C-mutant allele frequency in refractory tumors, we also found reactivation of the MAPK pathway despite no new mutations in KRAS or its downstream mediators. Tumor cell-intrinsic and non-cell autonomous mechanisms included increased complement activation, coagulation, and tumor angiogenesis, and several lines of evidence of immunologic evasion.CONCLUSIONTogether, our findings reveal numerous mechanisms of resistance to current KRAS G12C inhibitors through enrichment of clonal populations, KRAS-independent downstream signaling, and diverse remodeling of the tumor microenvironment.FUNDINGRichard and Fran Duley, Jimmy and Kay Mann, the NIH, and the North Carolina Biotechnology Center.
    MeSH term(s) Adenocarcinoma of Lung/enzymology ; Adenocarcinoma of Lung/genetics ; Amino Acid Substitution ; Drug Resistance, Neoplasm/genetics ; Humans ; Lung Neoplasms/enzymology ; Lung Neoplasms/genetics ; Mutation, Missense ; Proto-Oncogene Proteins p21(ras)/genetics ; Proto-Oncogene Proteins p21(ras)/metabolism ; Signal Transduction/genetics ; Tumor Microenvironment/genetics
    Chemical Substances KRAS protein, human ; Proto-Oncogene Proteins p21(ras) (EC 3.6.5.2)
    Language English
    Publishing date 2022-01-06
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI155523
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Two fatal herpesvirus cases: Treatable but easily missed diagnoses.

    Bookhout, Christine / Moylan, Vincent / Thorne, Leigh B

    IDCases

    2016  Volume 6, Page(s) 65–67

    Abstract: Ill or immunosuppressed hospital patients are at increased risk for herpes simplex and herpes zoster virus infections, with high potential morbidity and mortality. Here, we present two cases of reactivation of herpes virus infections with delay in ... ...

    Abstract Ill or immunosuppressed hospital patients are at increased risk for herpes simplex and herpes zoster virus infections, with high potential morbidity and mortality. Here, we present two cases of reactivation of herpes virus infections with delay in diagnosis, with ultimately fatal results. Since these infections are treatable, it is important to keep a high index of suspicion to facilitate early diagnosis and treatment.
    Language English
    Publishing date 2016-09-23
    Publishing country Netherlands
    Document type Journal Article ; Case Reports
    ZDB-ID 2745454-X
    ISSN 2214-2509
    ISSN 2214-2509
    DOI 10.1016/j.idcr.2016.09.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Generalized Modules for Membrane Antigens (GMMA), an outer membrane vesicle-based vaccine platform, for efficient viral antigen delivery.

    Hu, Kai / Palmieri, Elena / Samnuan, Karnyart / Ricchetti, Beatrice / Oldrini, Davide / McKay, Paul F / Wu, Guanghui / Thorne, Leigh / Fooks, Anthony R / McElhinney, Lorraine M / Goharriz, Hooman / Golding, Megan / Shattock, Robin J / Micoli, Francesca

    Journal of extracellular vesicles

    2022  Volume 11, Issue 11, Page(s) e12247

    Abstract: Vaccine platforms enable fast development, testing, and manufacture of more affordable vaccines. Here, we evaluated Generalized Modules for Membrane Antigens (GMMA), outer membrane vesicles (OMVs) generated by genetically modified Gram-negative bacteria, ...

    Abstract Vaccine platforms enable fast development, testing, and manufacture of more affordable vaccines. Here, we evaluated Generalized Modules for Membrane Antigens (GMMA), outer membrane vesicles (OMVs) generated by genetically modified Gram-negative bacteria, as a vaccine platform for viral pathogens. Influenza A virus hemagglutinin (HA), either physically mixed with GMMA (HA+STmGMMA mix), or covalently linked to GMMA surface (HA-STmGMMA conjugate), significantly increased antigen-specific humoral and cellular responses, with HA-STmGMMA conjugate inducing further enhancement than HA+STmGMMA mix. HA-STmGMMA conjugate protected mice from lethal challenge. The versatility for this platform was confirmed by conjugation of rabies glycoprotein (RABVG) onto GMMA through the same method. RABVG+STmGMMA mix and RABVG-STmGMMA conjugate exhibited similar humoral and cellular response patterns and protection efficacy as the HA formulations, indicating relatively consistent responses for different vaccines based on the GMMA platform. Comparing to soluble protein, GMMA was more efficiently taken up in vivo and exhibited a B-cell preferential uptake in the draining lymph nodes (LNs). Together, GMMA enhances immunity against viral antigens, and the platform works well with different antigens while retaining similar immunomodulatory patterns. The findings of our study imply the great potential of GMMA-based vaccine platform also against viral infectious diseases.
    MeSH term(s) Mice ; Animals ; Antigens, Viral ; Vaccines ; Membranes
    Chemical Substances Antigens, Viral ; glyceryl methyl methacrylate ; Vaccines
    Language English
    Publishing date 2022-11-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2683797-3
    ISSN 2001-3078 ; 2001-3078
    ISSN (online) 2001-3078
    ISSN 2001-3078
    DOI 10.1002/jev2.12247
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Transmissible spongiform encephalopathy in goats: is PrP rapid test sensitivity affected by genotype?

    Simmons, Marion M / Thorne, Leigh / Ortiz-Pelaez, Angel / Spiropoulos, John / Georgiadou, Soteria / Papasavva-Stylianou, Penelope / Andreoletti, Olivier / Hawkins, Stephen A.C / Meloni, Daniela / Cassar, Claire

    Journal of veterinary diagnostic investigation. 2020 Jan., v. 32, no. 1

    2020  

    Abstract: Transmissible spongiform encephalopathy (TSE) surveillance in goats relies on tests initially approved for cattle, subsequently assessed for sheep, and approval extrapolated for use in “small ruminants.” The current EU-approved immunodetection tests ... ...

    Abstract Transmissible spongiform encephalopathy (TSE) surveillance in goats relies on tests initially approved for cattle, subsequently assessed for sheep, and approval extrapolated for use in “small ruminants.” The current EU-approved immunodetection tests employ antibodies against various epitopes of the prion protein PrPSc, which is encoded by the host PRNP gene. The caprine PRNP gene is polymorphic, mostly at codons different from the ovine PRNP. The EU goat population is much more heterogeneous than the sheep population, with more PRNP-related polymorphisms, and with marked breed-related differences. The ability of the current tests to detect disease-specific PrPSc generated against these different genetic backgrounds is currently assumed, rather than proven. We examined whether common polymorphisms within the goat PRNP gene might have any adverse effect on the relative performance of EU-approved rapid tests. The sample panel comprised goats from the UK, Cyprus, France, and Italy, with either experimental or naturally acquired scrapie at both the preclinical and/or unknown and clinical stages of disease. Test sensitivity was significantly lower and more variable when compared using samples from animals that were preclinical or of unknown status. However, all of the rapid tests included in our study were able to correctly identify all samples from animals in the clinical stages of disease, apart from samples from animals polymorphic for serine or aspartic acid at codon 146, in which the performance of the Bio-Rad tests was profoundly affected. Our data show that some polymorphisms may adversely affect one test and not another, as well as underline the dangers of extrapolating from other species.
    Keywords European Union ; adverse effects ; antibodies ; aspartic acid ; cattle ; codons ; epitopes ; genetic background ; goats ; monitoring ; prions ; rapid methods ; scrapie ; serine ; sheep ; Cyprus ; France ; Italy ; United Kingdom
    Language English
    Dates of publication 2020-01
    Size p. 87-93.
    Publishing place SAGE Publications
    Document type Article
    ZDB-ID 287603-6
    ISSN 1943-4936 ; 1040-6387
    ISSN (online) 1943-4936
    ISSN 1040-6387
    DOI 10.1177/1040638719896327
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Incomplete inactivation of atypical scrapie following recommended autoclave decontamination procedures

    Spiropoulos, John / Andreoletti, Olivier / Arnold, Mark / Beck, Katy E / Holder, Thomas M / Lockey, Richard / Simmons, Marion M / Terry, Linda A / Thorne, Leigh / Vickery, Chris

    Transboundary and emerging diseases. 2019 Sept., v. 66, no. 5

    2019  

    Abstract: Prions are highly resistant to the decontamination procedures normally used to inactivate conventional pathogens. This is a challenging problem not only in the medical and veterinary fields for minimizing the risk of transmission from potentially ... ...

    Abstract Prions are highly resistant to the decontamination procedures normally used to inactivate conventional pathogens. This is a challenging problem not only in the medical and veterinary fields for minimizing the risk of transmission from potentially infective sources but also for ensuring the safe disposal or subsequent use of animal by‐products. Specific pressure autoclaving protocols were developed for this purpose, but different strains of prions have been reported to have differing resistance patterns to established prion decontamination procedures, and as additional TSE strains are identified it is necessary to determine the effectiveness of such procedures. In this study we assessed the efficacy of sterilization using the EU recommended autoclave procedure for prions (133°C, 3 Bar for 20 min) on the atypical or Nor98 (AS/Nor98) scrapie strain of sheep and goats. Using a highly sensitive murine mouse model (tg338) that overexpresses ovine PrPC, we determined that this method of decontamination reduced the infectivity titre by 1010. Infectivity was nonetheless still detected after applying the recommended autoclaving protocol. This shows that AS/Nor98 can survive the designated legislative decontamination conditions, albeit with a significant decrease in titre. The infectivity of a classical scrapie isolate subjected to the same decontamination conditions was reduced by 106 suggesting that the AS/Nor98 isolate is less sensitive to decontamination than the classical scrapie source.
    Keywords animal byproducts ; animal models ; autoclaves ; autoclaving ; decontamination ; European Union ; goats ; mice ; pathogenicity ; pathogens ; prions ; risk ; scrapie ; sheep
    Language English
    Dates of publication 2019-09
    Size p. 1993-2001.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2414822-2
    ISSN 1865-1682 ; 1865-1674
    ISSN (online) 1865-1682
    ISSN 1865-1674
    DOI 10.1111/tbed.13247
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Re-evaluating the effect of Favipiravir treatment on rabies virus infection

    Banyard, Ashley C / Birch, Colin / Fooks, Anthony R / Koraka, Penelope / Mansfield, Karen L / Osterhaus, Albert D.M.E / Selden, David / Thorne, Leigh / Wu, Guanghui

    Vaccine. 2019 Aug. 02, v. 37, no. 33

    2019  

    Abstract: There is no antiviral treatment available once clinical disease following rabies virus infection has initiated. Considered a neglected tropical disease, >60,000 human rabies deaths are estimated each year despite the availability of pre- and post- ... ...

    Abstract There is no antiviral treatment available once clinical disease following rabies virus infection has initiated. Considered a neglected tropical disease, >60,000 human rabies deaths are estimated each year despite the availability of pre- and post-exposure prophylaxis for pre-immunisation or administration following a potential exposure before the onset of clinical disease. Such post-exposure treatments include administration of rabies immunoglobulin (RIG) and vaccination at a distant site to prime a humoral immune response. However, current therapeutic options are limited. Regardless there is a need for molecules that target virus infection following the onset of clinical disease where the outcome of infection is invariably fatal. Numerous molecules have been assessed as potential antivirals against rabies virus (RABV) but with little promise. Favipiravir (T-705) is a broad-spectrum RNA polymerase inhibitor, which has been shown to have antiviral activity against a range of RNA viruses including some against RABV. In the present study, the utility of T-705 has been reassessed in vitro as well as in vivo in a murine model using intraperitoneal administration to investigate any immune protective effect of the molecule. In vitro T-705 effectively reduces RABV replication. However, in vivo, following assessment of various applications of the molecule in both pre- and post-exposure scenarios, the effect was limited. T-705 treatment delayed the onset of clinical signs when virus was delivered intramuscularly at a higher dose (106.8 TCID50/ml) and reduced the number of mice that developed clinical signs when virus was delivered at a lower dose (105.8 TCID50/ml) during the observation period. The day at which treatment commenced did not appear to have a statistically significant effect on the results in either experiment. The use of T-705 as a single biological entity may be limited, however, further work is required to assess the synergistic effect of T-705 as a component of a multi-drug therapy for treating human rabies infections.
    Keywords animal models ; antiviral agents ; antiviral properties ; DNA-directed RNA polymerase ; humans ; humoral immunity ; immunoglobulins ; intraperitoneal injection ; mice ; protective effect ; rabies ; Rabies virus ; vaccination ; vaccines ; virus replication ; viruses
    Language English
    Dates of publication 2019-0802
    Size p. 4686-4693.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 605674-x
    ISSN 1873-2518 ; 0264-410X
    ISSN (online) 1873-2518
    ISSN 0264-410X
    DOI 10.1016/j.vaccine.2017.10.109
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: In vitro amplification of PrP(Sc) derived from the brain and blood of sheep infected with scrapie

    Thorne, Leigh / Terry, Linda A

    Journal of general virology. 2008 Dec., v. 89, pt. 12

    2008  

    Abstract: Scrapie is a fatal, naturally transmissible, neurodegenerative prion disease that affects sheep and goats and is characterized by the accumulation of a misfolded protein, PrP(Sc), converted from host-encoded PrP(c), in the central nervous system of ... ...

    Abstract Scrapie is a fatal, naturally transmissible, neurodegenerative prion disease that affects sheep and goats and is characterized by the accumulation of a misfolded protein, PrP(Sc), converted from host-encoded PrP(c), in the central nervous system of affected animals. Highly efficient in vitro conversion of host PrP(c) to PrP(Sc) has been achieved in models of scrapie and in natural prion diseases by protein misfolding cyclic amplification (PMCA). Here, we demonstrate amplification, by serial PMCA, of PrP(Sc) from individual sources of scrapie-infected sheep. Efficiency of amplification was affected by the pairing of the source of PrP(Sc) with the control brain substrate of different genotypes of PrP. In line with previous studies, efficiency of amplification was greatly enhanced with the addition of a synthetic polyanion, polyadenylic acid (PolyA), facilitating rapid detection of low levels of PrP(Sc) from body fluids such as blood. To this end PrP(Sc) was amplified, in a 3 day PMCA assay, from blood leukocyte preparations from VRQ/VRQ scrapie-affected sheep at clinical end point. While PolyA-assisted PMCA resulted in spontaneous conversion of PrP(c), we were able to distinguish blood samples from unaffected and affected sheep under controlled conditions. This study demonstrates that highly efficient amplification of PrP(Sc) can be achieved for ovine scrapie from both brain and blood from naturally infected sheep and shows potential applications for improvements in current diagnostics and pre-mortem testing.
    Keywords sheep ; scrapie ; PrPSc proteins ; brain ; blood
    Language English
    Dates of publication 2008-12
    Size p. 3177-3184.
    Document type Article
    ZDB-ID 219316-4
    ISSN 1465-2099 ; 0022-1317
    ISSN (online) 1465-2099
    ISSN 0022-1317
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Evidence of scrapie transmission to sheep via goat milk.

    Konold, Timm / Thorne, Leigh / Simmons, Hugh A / Hawkins, Steve A C / Simmons, Marion M / González, Lorenzo

    BMC veterinary research

    2016  Volume 12, Page(s) 208

    Abstract: Background: Previous studies confirmed that classical scrapie can be transmitted via milk in sheep. The current study aimed to investigate whether scrapie can also be transmitted via goat milk using in vivo (new-born lambs fed milk from scrapie-affected ...

    Abstract Background: Previous studies confirmed that classical scrapie can be transmitted via milk in sheep. The current study aimed to investigate whether scrapie can also be transmitted via goat milk using in vivo (new-born lambs fed milk from scrapie-affected goats due to the unavailability of goat kids from guaranteed scrapie-free herds) and in vitro methods (serial protein misfolding cyclic amplification [sPMCA] on milk samples).
    Results: In an initial pilot study, new-born lambs of two different prion protein gene (PRNP) genotypes (six VRQ/VRQ and five ARQ/ARQ) were orally challenged with 5 g brain homogenate from two scrapie-affected goats to determine susceptibility of sheep to goat scrapie. All sheep challenged with goat scrapie brain became infected based on the immunohistochemical detection of disease-associated PrP (PrP(sc)) in lymphoid tissue, with an ARQ/ARQ sheep being the first to succumb. Subsequent feeding of milk to eight pairs of new-born ARQ/ARQ lambs, with each pair receiving milk from a different scrapie-affected goat, resulted in scrapie in the six pairs that received the largest volume of milk (38-87 litres per lamb), whereas two pairs fed 8-9 litres per lamb, and an environmental control group raised on sheep milk from healthy ewes, did not show evidence of infection when culled at up to 1882 days of age. Infection in those 12 milk recipients occurred regardless of the clinical status, PrP(sc) distribution, caprine arthritis-encephalitis virus infection status and PRNP polymorphisms at codon 142 (II or IM) of the donor goats, but survival time was influenced by PRNP polymorphisms at codon 141. Serial PMCA applied to a total of 32 milk samples (four each from the eight donor goats collected throughout lactation) detected PrP(sc) in one sample each from two goats.
    Conclusions: The scrapie agent was present in the milk from infected goats and was able to transmit to susceptible species even at early preclinical stage of infection, when PrP(sc) was undetectable in the brain of the donor goats. Serial PMCA as a PrP(sc) detection method to assess the risk of scrapie transmission via milk in goats proved inefficient compared to the bioassay.
    MeSH term(s) Animals ; Animals, Newborn ; Genotype ; Goats ; Milk ; Prion Proteins/genetics ; Scrapie/transmission ; Sheep ; Survival Analysis
    Chemical Substances Prion Proteins
    Language English
    Publishing date 2016-09-17
    Publishing country England
    Document type Journal Article
    ISSN 1746-6148
    ISSN (online) 1746-6148
    DOI 10.1186/s12917-016-0807-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Molecular characterisation of atypical BSE prions by mass spectrometry and changes following transmission to sheep and transgenic mouse models.

    Gielbert, Adriana / Thorne, Jemma K / Plater, Jane M / Thorne, Leigh / Griffiths, Peter C / Simmons, Marion M / Cassar, Claire A

    PloS one

    2018  Volume 13, Issue 11, Page(s) e0206505

    Abstract: The prion hypothesis proposes a causal relationship between the misfolded prion protein (PrPSc) molecular entity and the disease transmissible spongiform encephalopathy (TSE). Variations in the conformation of PrPSc are associated with different forms of ...

    Abstract The prion hypothesis proposes a causal relationship between the misfolded prion protein (PrPSc) molecular entity and the disease transmissible spongiform encephalopathy (TSE). Variations in the conformation of PrPSc are associated with different forms of TSE and different risks to animal and human health. Since the discovery of atypical forms of bovine spongiform encephalopathy (BSE) in 2003, scientists have progressed the molecular characterisation of the associated PrPSc in order to better understand these risks, both in cattle as the natural host and following experimental transmission to other species. Here we report the development of a mass spectrometry based assay for molecular characterisation of bovine proteinase K (PK) treated PrPSc (PrPres) by quantitative identification of its N-terminal amino acid profiles (N-TAAPs) and tryptic peptides. We have applied the assay to classical, H-type and L-type BSE prions purified from cattle, transgenic (Tg) mice expressing the bovine (Tg110 and Tg1896) or ovine (TgEM16) prion protein gene, and sheep brain. We determined that, for classical BSE in cattle, the G96 N-terminal cleavage site dominated, while the range of cleavage sites was wider following transmission to Tg mice and sheep. For L-BSE in cattle and Tg bovinised mice, a C-terminal shift was identified in the N-TAAP distribution compared to classical BSE, consistent with observations by Western blot (WB). For L-BSE transmitted to sheep, both N-TAAP and tryptic peptide profiles were found to be changed compared to cattle, but less so following transmission to Tg ovinised mice. Relative abundances of aglycosyl peptides were found to be significantly different between the atypical BSE forms in cattle as well as in other hosts. The enhanced resolution provided by molecular analysis of PrPres using mass spectrometry has improved insight into the molecular changes following transmission of atypical BSE to other species.
    MeSH term(s) Amino Acid Sequence ; Animals ; Cattle ; Chromatography, High Pressure Liquid ; Disease Models, Animal ; Encephalopathy, Bovine Spongiform/metabolism ; Encephalopathy, Bovine Spongiform/transmission ; Mass Spectrometry ; Mice ; Mice, Transgenic ; Peptide Fragments/chemistry ; Peptide Fragments/metabolism ; Prion Proteins/chemistry ; Prion Proteins/metabolism ; Sheep
    Chemical Substances Peptide Fragments ; Prion Proteins
    Language English
    Publishing date 2018-11-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0206505
    Database MEDical Literature Analysis and Retrieval System OnLINE

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