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SUMMARY The origins of the constituents of epididymal plasma from the cauda epididymidis of the rabbit have been investigated. Results show that the epididymis actively absorbs Na+ and Cl− ions and actively secretes glycerylphosphorylcholine, protein, alkaline phosphatase, acid phosphatase, β-N-acetylglucosaminidase, α-mannosidase and acid deoxyribonuclease. Degenerating spermatozoa contribute K+ ions and material giving a positive reaction with diphenylamine reagent. It is suggested that in a normal animal, spermatozoa are suspended in a 'degradative milieu' and that this is involved in the disappearance of spermatozoa after castration.
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Roy Jones (1974) studied this question.
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