Word: gonads
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Dates: during 1923-1923
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...Steinach's operation, no new material is transplanted. He discovered that if the reproductive function of the gonads is stopped by removing part of their duct (called the "vas deferens"), or even by tying it off, the reproductive cells atrophy and the interstitial cells multiply and occupy the space, greatly increasing the flow of the hormones. The effect is to turn the gonad into an exclusively ductless gland. The same general results are produced as in the case of transplantation. Steinach himself makes no extravagant claims. He calls the effect " arrest within modest limits of the process of senility...