Negative regulator of T-cell proliferation.
Subcellular locations: Membrane
Isoform 2 is present in the nuclear, vesicle and plasma membranes, isoform 3 is found in cytoplasmic vesicle structures and is not membrane bound.
Expressed in brain, heart, kidney, liver, pancreas, ovary, leukocyte, small intestine, testis and thymus.