Requires caveolae biogenesis to be secreted from the endoplasmic reticulum going through the Golgi apparatus where is post-translationally processed to the mature form. Expressed in tracheal serous gland, heart, muscle, fat, lung, ovary, liver, kidney, adrenal gland and brain (at protein level). Proteolytically cleaved. Cleaved at Arg-112 and Arg-424 leading to a processed mature product of 35 kDa. The cleavage takes place in the Golgi apparatus. Belongs to the GASK family.