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The chromosome of Bacteroides fragilis strain YCH46 was shown to be a single circular DNA molecule of about 5.3 Mb having 16 NotI, seven AscI, and six I-CeuI sites. A physical map of the chromosome was constructed by four independent experimental approaches: linking clone analysis, cross-Southern hybridization, partial restriction digestion, and two-dimensional pulsed-field gel electrophoresis. Six rRNA operons and 10 known genes were localized on the physical map.
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Kuwahara et al. (2002) studied this question.
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