The present invention relates to a novel T1 Receptor (T1R)-like ligand II protein. In particular, isolated nucleic acid molecules are provided encoding the T1R-like ligand II protein. T1R-like ligand II polypeptides are also provided, as are recombinant vectors and host cells for expressing the same. This invention further relates to pharmaceutical compositions and formulations comprising T1R-like ligand II. Also provided are methods of using T1R-like ligand II polynucleotides, polypeptides, antibodies or agonists/antagonists for therapeutic and diagnostic purposes. Diagnostic kits are further provided.