Abstract

The phospholipid-binding protein (PBP) isolated from bull seminal vesicle fluid removed cytoplasm droplets not only from bull, but also from ram, boar and rabbit epididymal spermatozoa. However, the presence of a protein cross-reacting with anti-PBP antisera was demonstrated by immunofluorescent staining in ram seminal vesicles and ampullae. In contrast to PBP from bull, the ram PBP-like protein did not lyse bull or ram erythrocytes. Rabbit antiserum against PBP only negligibly reduced the ability of PBP to remove cytoplasm droplets from bull epididymal spermatozoa, but it inhibited the haemolytic effect of the protein.

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