using antibodies specific for calicin , a prominent mr-60,000 cytoskeletal protein of the posterior calyx of bull sperm heads detected in immunoblotting on gel electrophoretically separated polypeptides as well as in immunofluorescence and immunoelectron microscopy , we show that the same -- or an immunologically related -- polypeptide occurs in sperm heads of other species with greatly different morphology , including human , boar , guinea pig , hamster , rat and mouse .
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of the
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sperm