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The hybridization capacity of ribonucleic acid produced during hormone action.
Wyatt GR
,
Tata JR
.
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1. Measurements of hybridization with homologous DNA were used to assess the nature of the RNA synthesized during hormone action in several systems. 2. When increasing amounts of pulse-labelled rat liver nuclear RNA were annealed with constant amounts of DNA, saturation was not achieved even with RNA/DNA ratios of up to 180:1, which is taken to indicate great diversity in the species of labelled RNA molecules. In the converse experiment, when the DNA/RNA ratio was varied up to 20:1, a plateau of hybridization was observed, and the non-hybridizing RNA is believed to represent chiefly ribosomal and ribosomal precursor species. 3. In the livers of hypophysectomized and thyroidectomized rats treated with growth hormone and tri-iodothyronine, and in whole Xenopus larvae during induced metamorphosis, the synthesis of non-hybridizing RNA was consistently stimulated more than that of hybridizing RNA. This is interpreted as reflecting preferential synthesis of ribosomal RNA in response to these hormones.
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