programmed cell death 1 (pd-1, cd279) receptor protein, 3d rende

programmed cell death 1 pd-1 cd 279 pdcd1 surface receptor immune white blood system apoptosis inhibitor tumor cancer pd-l1 ligand nivolumab antibody melanoma metastatic pembrolizumab structure peptide protein amino acid molecule polypeptide polymer atoms science scientific disease health molecular model 3d rendering illustration