SULT1A1 is a symbol for the gene, Sulfotransferase family 1A member 1, in humans. Other names include: Sulfotransferase 1A1; Aryl sulfotransferase 1; HAST1/HAST2; Phenol sulfotransferase 1; Phenol-sulfating phenol sulfotransferase 1; P-PST 1; ST1A3; Thermostable phenol sulfotransferase; Ts-PST; ST1A1; STP; STP1; TSPST1; sulfotransferase family, cytosolic, 1A, phenol-preferring, member 1. The encoded protein is an enzyme with an amino acid length of 295 and a mass of 34.2 kDa. Other isoforms may exist. SULT1A1 is a member of the Sulfotransferase 1 family. This gene shares homology with other species, including: Mouse, Rat, Frog.