XAP-2 is an alias for the human gene, Aryl hydrocarbon receptor interacting protein, or, AIP. Other names include: AH receptor-interacting protein; Aryl-hydrocarbon receptor-interacting protein; HBV X-associated protein 2; XAP-2; Immunophilin homolog ARA9; FKBP16; FKBP37; SMTPHN; XAP2. The encoded protein has an amino acid length of 330 and a mass of 37.6 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse.