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 skin, lung and colon (at protein level). O-glycosylated with core 1 or possibly core 8 glycans. Proteolytically cleaved. Cleaved at Arg-120 and Arg-437 leading to a processed mature product of 35 kDa. The cleavage takes place in the Golgi apparatus. Belongs to the GASK family.