The role of Growth Hormone and Dexamethasone in the regulation of rRNA gene activity was evaluated on cultured human fibroblasts by the cyto-chemical method of selective silver staining. By this method the transcriptionally active r-gene clusters can be specifically visualized in individual cells. Statistically significant increases in the rate of rRNA transcriptional activity were demonstrated after hormone administration.
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Baldini et al. (1985) studied this question.
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