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Structure of eukaryotic chromosomes and chromatin part 4 the 75s rna transcription unit in balbiani ring 2 and its relation to chromosome structure



Structure of eukaryotic chromosomes and chromatin part 4 the 75s rna transcription unit in balbiani ring 2 and its relation to chromosome structure



Philosophical Transactions of the Royal Society of London B Biological Sciences 283(997): 383-390



A defined transcription unit in the Balbiani ring 2 (BR 2) region of chromosome IV in the salivary glands of Chironomus tentans was characterized on the basis of analysis of the corresponding primary transcript, 75S RNA, and its functional significance. The size of the 75S RNA transcription unit in BR 2 is on the order of 30,000 base pairs. The unit is likely to contain a long coding segment (at least 6000 base pairs), probably corresponding to information for salivary polypeptides. The sequences are distributed in more than one chromomere (probably in 3-5 chromomeres). Whether or not there is a simple one-to-one relation between chromomeres and transcription units in the BR 2 region remains to be conclusively studied.

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