SRY encodes the human gene, Sex determining region Y. It may also be known as: Sex-determining region Y protein; Testis-determining factor; SRXX1; SRXY1; TDF; TDY. The encoded protein has an amino acid length of 204 and a mass of 23.9 kDa. Other isoforms may exist. SRY is a member of the SRY family. Homologs of this gene exist in other organisms, including: Mouse, Fly, Rat, Frog.