Function: Putative serine protease inhibitor. miscellaneous: May serve as a marker following prostatectomy for prostate cancer. PTM: N-glycosylated. similarity: Belongs to the CRISP family. subunit: Interacts with PSP94/MSMB. tissue specificity: Expressed in prostate, testis, ovary and intestine. Concentrates in prostate cencer patient's sera.