Abstract
Estrogen stimulates both the synthesis of nuclear RNA and the uptake of RNA precursor by the uterus within 2 min. following administration of the hormone to the ovariectomized adult rat. The immediacy of these effects clearly illustrates that estrogen in some unknown way stimulates membrane activity and transcription of DNA. This results in a very rapid synthesis of a few specific molecules of RNA which presumably initiate and support the subsequent stimulation of uterine protein synthesis.

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