4D8P:
reference: Structural and functional studies of the trans-encoded HLA-DQ2.3 (DQA1*03:01/DQB1*02:01) molecule., Tollefsen S, Hotta K, Chen X, Simonsen B, Swaminathan K, Mathews II, Sollid LM, Kim CY, J Biol Chem. 2012 Feb 23. PMID: 22362761

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