SULT1A4 encodes the human gene, Sulfotransferase family 1A member 4. It may also be known as: Sulfotransferase 1A4; ST1A4; HAST3; M-PST; ST1A3/ST1A4; TL-PST; sulfotransferase family, cytosolic, 1A, phenol-preferring, member 4. The encoded protein is an enzyme with an amino acid length of 295 and a mass of 34.2 kDa. Other isoforms may exist. SULT1A4 is a member of the Sulfotransferase 1 family.