ERAP1 encodes the human gene, Endoplasmic reticulum aminopeptidase 1. It may also be known as: ARTS-1; Adipocyte-derived leucine aminopeptidase; A-LAP; Aminopeptidase PILS; Puromycin-insensitive leucyl-specific aminopeptidase; PILS-AP; Type 1 tumor necrosis factor receptor shedding aminopeptidase regulator; Endoplasmic reticulum aminopeptidase 1 ; aminopeptidase regulator of TNFR1 shedding; ALAP; APPILS; ARTS1; ERAAP; ERAAP1; PILSAP. The encoded protein is an enzyme with an amino acid length of 941 and a mass of 107.2 kDa. Other isoforms may exist. ERAP1 is a member of the Peptidase M1 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.