PDB entry 4Y1A contains the proteins listed below.

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Insulin (P01308) UniProt residues in chain C: 75 - 90 View details
HLA class II histocompatibility antigen, DR alpha chain (P01903) UniProt residues in chain A: 26 - 206 View details
HLA class II histocompatibility antigen, DRB1 beta chain (P01911) UniProt residues in chain B: 30 - 219 View details
Insulin A chain (PRO_0000015821) UniProt residues in chain C: 90 - 90 View details