| 1NPU: reference: Structural and functional analysis of the costimulatory receptor programmed death-1., Zhang X, Schwartz JC, Guo X, Bhatia S, Cao E, Lorenz M, Cammer M, Chen L, Zhang ZY, Edidin MA, Nathenson SG, Almo SC, Immunity 2004 Mar;20(3):337-47. PMID: 15030777 |
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