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Mitochondrial (mt) DNA of higher plants is unique in its large size and complexity. We report here a hitherto unknownfeature, the presence of large quantities of single-stranded (ss) DNA. About 2.0-8.5% of the chromosomal mtDNA from a suspension culture (depending on the growth stage) and 6.5% of the chromosomal mtDNA from whole plants of Chenopodium album were found to be in ss form by dot-blot hybridization...
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