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In vivo expression of CO dehydrogenase/acetyl coenzyme A synthase in Methanosarcina spp. is coordinately regulated in response to substrate by at least two mechanisms: differential transcription initiation and early elongation termination near the 3' end of a 371-bp leader sequence. This is the first report of regulation of transcription elongation in the Archaea.
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Anderson et al. (2009) studied this question.
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