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Sporulation efficiencies of C. perfringens SM101 and the sigma factor mutants with and without complementing plasmids. Sporulation efficiencies of wild-type strain SM101 and mutants KM1 (sigK mutant) and KM2 (sigE mutant) were measured with no plasmid or with complementing plasmid. pKM2, wild-type sigK gene; pKM3, wild-type sigE gene; bar, standard deviation.
