4PG9:
reference: The first step of peptide selection in antigen presentation by MHC class I molecules., Garstka MA, Fish A, Celie PH, Joosten RP, Janssen GM, Berlin I, Hoppes R, Stadnik M, Janssen L, Ovaa H, van Veelen PA, Perrakis A, Neefjes J, Proc Natl Acad Sci U S A. 2015 Feb 3;112(5):1505-10. doi:, 10.1073/pnas.1416543112. Epub 2015 Jan 20. PMID: 25605945

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