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A method was devised which permitted the efficient labelling of soybean mitochondrial transcripts carrying initiator 5′ di- or tri-phosphate termini with [α-32P]GTP and the capping enzyme guanylyltransferase. The RNAs labelled in this manner appear to represent several different transcription initiation sites and to be present at only low to moderate abundance in soybean mtRNA preparations.
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Auchincloss et al. (1989) studied this question.
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