Possesses a trypsin-like cleavage specificity with a preference for poly-basic substrates. Stimulates epithelial sodium channel (ENaC) activity through activating cleavage of the gamma subunits (SCNN1G) (By similarity). Heterodimer of two chains, light and heavy, held by a disulfide bond. Found in the seminal fluid. Secreted after cleavage of its C-terminus. Found in the seminal fluid. Secreted after cleavage of its C-terminus. Belongs to the peptidase S1 family.