2FSE:
reference: Crystallographic Structure of a Rheumatoid Arthritis MHC Susceptibility Allele, HLA-DR1 (DRB1*0101), Complexed with the Immunodominant Determinant of Human Type II Collagen., Rosloniec EF, Ivey RA 3rd, Whittington KB, Kang AH, Park HW, J Immunol. 2006 Sep 15;177(6):3884-92. PMID: 16951351

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