The presence of corticosterone in rat testes was demonstrated by combining HPLC and RIA techniques. The presence of the hormone was also taken into account. The testicular corticosterone content was shown to depend upon the functional activity of the adrenals and to diminish acutely after adrenalectomy. Analysis of correlation between the concentration of the hormones in the plasma and testes has shown corticosterone to be formed by testicular cells.
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