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Seminal plasma from 120 subjects was examined by crossed immunoelectrophoresis using anti-seminal plasma. The samples were divided into two groups depending on a precipitation line which migrated fast in the first dimension electrophoresis. This precipitation line showed an incidence of 48 percent and was proved to have no acid phosphatase, esterase or lactate dehydrogenase activity and was not stained with Schiff's reagent. Analysis with column chromatography, Sephadex G-200 and Sephadex G-50, revealed that molecular weight of the protein was about 10,000 dolton. The difference was not identified with the other methods; polyacrylamide gel electrophoresis and agarose immunoelectrophoresis.

Individual difference of seminal plasma detected with crossed immunoelectrophoresis.