Stimulates lipid degradation in adipocytes and causes the extensive fat losses associated with some advanced cancers. May bind polyunsaturated fatty acids. Interacts with PIP. Blood plasma, seminal plasma, urine, saliva, sweat, epithelial cells of various human glands, liver. N-glycosylated. N-glycan at Asn-128: Hex5HexNAc4. Belongs to the MHC class I family. It is uncertain whether Met-1 or Met-4 is the initiator. Extended N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.