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Article Leupeptin and Antipain. Strong Competitive Inhibitors of Sperm Acrosomal Proteinase (Boar Acrosin) and Kallikreins from Porcine Organs (Pancreas, Submand. Glands, Urine) was published on January 1, 1973 in the journal Biological Chemistry (volume 354, issue 2).
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Fritz et al. (1973) studied this question.
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