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American Zoologist 1972 12(2):207-211; doi:10.1093/icb/12.2.207
© 1972 by The Society for Integrative and Comparative Biology
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Comparative Endocrinology of the Vertebrate Testis

GIOVANNI Chieffi
2nd Chan of Comparative Anatomy, Faculty of Sciences, University of Naples Naples, Italy

Andiogui seciction by llie lestis has been demonstrated in several repiesentatives of all classes of veitebiates, and sex hormone biosynthesis does not show lcmaikdble difTeienccs among them however, it is not known which is the trueindiogcn uoiking m vivo in nonmammahan vertebiates

The presence of steroid transforming enzymes in the gonads of Ciona intestinalis leads us to presume that sex hoimone biosynthesis of protochordates has long preceded the pattern present in veitebiates

The site of steroid hormone biosynthesis has been shown to be the interstitial tissue although in the embryonic testis of Sauropsida 3ß hydioxysteroid dehydrogenase is present only in the seminifeious tubules. These findings are discussed in the light of embiyological and experimental research.


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