Kallikrein-3 (PSA) protein, pivotal in the male reproductive system, hydrolyzes semenogelin-1, a seminal vesicle protein. This enzymatic activity initiates seminal coagulum liquefaction, crucial for sperm mobility and fertility. PSA's cleavage of semenogelin-1 highlights its importance in the complex processes of semen physiology and male reproductive function. Kallikrein-3/PSA Protein, Human (244a.a, HEK293, His) is the recombinant human-derived Kallikrein-3/PSA protein, expressed by HEK293 , with C-His labeled tag.