| 5B8C: reference: High-resolution crystal structure of the therapeutic antibody pembrolizumab bound to the human PD-1., Horita S, Nomura Y, Sato Y, Shimamura T, Iwata S, Nomura N, Sci Rep. 2016 Oct 13;6:35297. doi: 10.1038/srep35297. PMID: 27734966 |
This OCA 
Structure page
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(documentation).