ABCG5 encodes the human gene, ATP binding cassette subfamily G member 5. It may also be known as: ATP-binding cassette sub-family G member 5; Sterolin-1; sterolin 1; ATP-binding cassette, sub-family G (WHITE), member 5; STSL. The encoded protein has an amino acid length of 651 and a mass of 72.5 kDa. Other isoforms may exist. ABCG5 is a member of the ABC transporter superfamily, ABCG family, Eye pigment precursor importer (TC 3.A.1.204) subfamily. Homologs of this gene exist in other organisms, including: Mouse, Zebrafish, Chicken.