CD279 is an alias for the gene, Programmed cell death 1, in humans. Other names include: Programmed cell death protein 1; Protein PD-1; hPD-1; CD antigen CD279; SLEB2; hPD-l; hSLE1. The encoded protein has an amino acid length of 288 and a mass of 31.6 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse, Rat, Frog, Chicken.