Seminal pepsinogen C is not identical with, but is very similar to gastric pepsinogen C

Abstract
Human seminal pepsinogen C has been purified and compared with gastric pepsinogen C. The two zymogens cannot be distinguished by amino acid compositions and sequences of the first 28 N‐terminal amino acid residues are identical. Apparent immunological identity is observed with polyclonal antisera. Monoclonal antibodies toward seminal pepsinogen C have been produced. One is able to recognize a non‐carbohydrate antigenic determinant only present in seminal pepsinogen C.