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Proc Natl Acad Sci U S A
1979 May 01;765:2209-12. doi: 10.1073/pnas.76.5.2209.
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Distinct single-copy sequence sets in sea urchin nuclear RNAs.
Ernst SG
,
Britten RJ
,
Davidson EH
.
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The purpose of this study was to determine whether nuclear RNAs (nRNA) of sea urchin embryos and adult tissues contain identical or partially distinct sets of single-copy sequence transcripts. A DNA tracer was prepared consisting mainly of sequences absent from gastrula nRNA; 3.6% of this tracer reacted with adult intestine nRNA but not with gastrula nRNA. The existence of a differentially transcribed DNA fraction was verified by its partial purification and rehybridization to intestine and gastrula nRNAs. About one-third of the genomic single-copy sequence is represented in both nRNAs, or about 2 x 10(8) nucleotides. The differentially transcribed portion of the single-copy genome identified in this work includes about 3.5 x 10(7) nucleotides.
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