Two new species of cytoplasmic RNA with approximate sedimentation values of 12 S and 21 S , and which appear associated with mitochondria, are described. The species are unmethylated, are relatively metabolically stable, and have a 43 per cent G + C content. Their synthesis is uniquely resistant to inhibition by UV irradiation. The 12 S and 21 S RNA do not appear to be components of polysome-like structures.
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Vesco et al. (1969) studied this question.
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