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Deletion of whiB prevents sporulation. Shown are the phenotypes of wild-type S. venezuelae (WT), the constructed ΔwhiB::apr SV7 null mutant (ΔwhiB::apr), SV7 carrying the empty pMS82 vector (ΔwhiB::apr attBΦBT1::pMS82), and the complemented strain SV7/pIJ6761 (ΔwhiB::apr attBΦBT1::whiB). Strains were grown on MYM solid medium and photographed after 4 days.
