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Ultrastructure of B. subtilis lacking wall teichoic acid. Strains of B. subtilis 168 were harvested at late log phase of growth and conventionally embedded in thin sections for examination with transmission electron microscopy as described previously (14). The (A) wild-type strain (EB6) along with the tagO deletion mutant (EB1451) in the (B) absence and (C) presence of MgCl2 are depicted. Arrows highlight areas of thickened cell wall. Bar, 500 nm.
