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During the early action of estrogen in the uterus of the ovariectomized rat, nuclear RNA synthesis in vivo is stimulated prior to the sequential stimulations of DNA-dependent RNA polymerase assayed in isolated nuclei incubated in the absence or the presence of ammonium sulfate. 1 The stimulation by the hormone of nuclear RNA synthesis in vivo also precedes the stimulation of nuclear protein synthesis in vivo, which in turn precedes the enhancement of cytoplasmic protein synthesis.2 These sequences of stimulation of RNA and protein synthesis in the nucleus have also been described for the early action of thyroid hormone in the liver. 3

Early estrogen action: nuclear synthesis and accumulation of protein correlated with enhancement of two DNA-dependent RNA polymerase activities.