| 3HLA: reference: Refined structure of the human histocompatibility antigen HLA-A2 at 2.6 A resolution., Saper MA, Bjorkman PJ, Wiley DC, J Mol Biol. 1991 May 20;219(2):277-319. PMID: 2038058 |
This OCA 
Structure page
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(documentation).