programmed cell death 1 pd-1, cd279 receptor protein. pd-1 is a major cancer drug target.

programmed cell death pd1 cd279 receptor protein major cancer drug target cd 279 pdcd1 surface immune white blood system apoptosis inhibitor tumor pdl1 ligand nivolumab antibody melanoma metastatic pembrolizumab pdb2m2d structure peptide amino acid molecule polypeptide polymer atoms science scientific disease health molecular model are represented as spheres conventional color coding