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After determination of the amino-acid sequence of a further acrosin inhibitor isolated from bull seminal plasma, the primary structures of the three seminal inhibitors known so far were compared with other homologous structures of protein-protein inhibitors. From the matrix of minimal base changes, a high divergence in the evolution of the seminal inhibitors can be seen. Inhibitors from bull seminal plasma show even a higher degree of relationship to dog submandibular gland inhibitor domain II and the 3rd domain of quail ovomucoid than to acrosin inhibitor from boar seminal plasma.

Homologies in the Structures of Bull Seminal Plasma Acrosin Inhibitors and Comparison with other Homologous Proteinase Inhibitors of the Kazal Type