3BOV:
reference: Crystal structure of the complex between programmed death-1 (PD-1) and its ligand PD-L2., Lazar-Molnar E, Yan Q, Cao E, Ramagopal U, Nathenson SG, Almo SC, Proc Natl Acad Sci U S A. 2008 Jul 29;105(30):10483-8. Epub 2008 Jul 18. PMID: 18641123

This OCA Structure page
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