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Mol Biol Rep
1979 Feb 15;44:241-6. doi: 10.1007/bf00777562.
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Study of ribosomal deoxyribonucleic acid of sea urchin.
Mishra NK
.
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The structure of ribosomal DNA (rDNA) satellite of sea urchin (Lytechinus variegatus) sperm has been re-examined after purification by two widely used methods. Saturation hybridization experiments indicate that about 28--32% of the rDNA contain sequences complementary to rRNA. Results of hyperchromic spectral analysis reveal that the rDNA melts as two distinct but unequal components. The early transition presumably corresponds to the melting of most of the transcribed part and the late transition is suggestive of the melting of a G + C-rich segment of the rDNA, which may be a nontranscribed spacer.
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