[Isoform 1]: Membrane ; Multi-pass membrane protein .; [Isoform 2]: Membrane ; Multi-pass membrane protein .; [Isoform 3]: Secreted .
Highly expressed in pancreas, testis and fetal liver. Moderately expressed in heart, prostate and small intestine. Expressed at very low levels in brain, thymus, ovary, colon, fetal lung and fetal kidney. Expressed in muscle. Isoform 3 is expressed in pituitary gland.