Enzymes have been located in the various parts of the spermatozoa of three inbred strains of mice, CBA, C57 and JBT, some enzymes giving very strong reactions. The acrosomal region contains glucose-6-phosphatase, ATPase and monoamine oxidase. The postnuclear cap appears to have only glucose-6-phosphatase whereas the head base shows reactivity for this and also for cholinesterase and monoamine oxidase. The bulk of the enzymes is located in the midpiece of the spermatozoon which not only contains all enzymes present in the other parts of the cell, but also gives positive reactions for various dehydrogenases, DOPA oxidase, \g=b\-glucuronidase and leucine aminopeptidase. The tail region differs from the midpiece in the absence of dehydrogenases and certain other enzymes. No significant variation has been observed in the activities of the enzymes between the different strains although in some instances minor differences are suspected.
Anatomically the male reproductive organs of Hemiechinus auritus collaris are of considerable interest and present a unique pattern of arrangement of different glands. The testes are inguinal and a true scrotum is absent. A pair of accessory glands, the seminal vesicles, are situated dorsal to the bladder. A pair of obviously lobulated glands, ventral to the bladder, represent the internal prostate and a pair of compact glands situated outside the pelvis in para‐anal position the external prostate. The Cowper's gland and the gland of ampulla are absent.
The present studies also concern enzymes of the phosphatase group, including both specific and non‐specific phosphatases, in the testes and the sex accessory glands during both active and inactive periods in this insectivore.
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