T1R2 - Taste receptor type 1 member 2 is a protein that in humans is encoded by the TAS1R2gene.[5]
The sweet taste receptor is predominantly formed as a dimer of T1R2 and T1R3 by which different organisms sense this taste. In songbirds, however, the T1R2 monomer does not exist, and they sense the sweet taste through the umami taste receptor (T1R1 and T1R3) as a result of an evolutionary change that it has undergone.[6]