programmed cell death 1 pd-1, cd279 receptor protein. pd-1 is a major cancer drug target. 3d rendering, beads on a string.

279 acid amino antibody apoptosis atoms blood cancer cell death disease health immune inhibitor ligand melanoma metastatic model molecular molecule nivolumab pd1 pdb2m2d pdcd1 pdl1 pembrolizumab peptide polymer polypeptide programmed protein receptor rendering science scientific structure surface system tumor white