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Effects of mutations in genes encoding sporulation-specific sigma factors on expression of rsfA-lacZ. Strains containing an rsfA-lacZ fusion in a wild-type background (● [strain BFA1335]) or in the presence of mutations in spoIIAC (○ [strain 1226]) and spoIIGA (▵ [strain 1227]) (A) or spoIIIG (◊ [strain 1228]) (B) were induced to sporulate at time zero, and samples were taken at intervals for assay of β-galactosidase activity.
