XIAP is a symbol for the gene, X-linked inhibitor of apoptosis, in humans. Other names include: E3 ubiquitin-protein ligase XIAP; ILP; hILP; Inhibitor of apoptosis protein 3; IAP-3; hIAP-3; hIAP3; X-linked inhibitor of apoptosis protein; X-linked IAP; Baculoviral IAP repeat-containing protein 4; E3 ubiquitin-protein ligase XIAP ; IAP-like protein; API3; BIRC4; ILP1; MIHA; X-linked inhibitor of apoptosis, E3 ubiquitin protein ligase; XLP2. The encoded protein is an enzyme with an amino acid length of 497 and a mass of 56.7 kDa. Other isoforms may exist. This gene shares homology with other species, including: Fly.