programmed cell death 1 (pd-1, cd279) receptor protein, 3d rendering. pd-1 is a major cancer drug target. atoms are represented as

programmed cell death pd1 cd 279 pdcd1 surface receptor immune white blood system apoptosis inhibitor tumor cancer pdl1 ligand nivolumab antibody melanoma metastatic pembrolizumab pdb2m2d structure peptide protein amino acid molecule polypeptide polymer atoms science scientific disease health molecular model 3d rendering illustration