Mature oocytes of Xenopus laevis contain a 7 S RNP particle consisting of two components, ribosomal 5 S RNA and a protein of Mr approximately 45000. The structure of the free 5 S rRNA and the 7 S RNP complex has been studied by diethylpyrocarbonate modification of adenines. A74, A77, A90, A100, A101 and A103 of the 5 S rRNA are protected upon association of the protein.
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Pieler et al. (1983) studied this question.
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