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Induction of σB by PO4 limitation in RplK̄ B. subtilis. B. subtilis strain BSZ9 (rplK57) was grown in low (Δ) or high (▪) PO4 synthetic medium. Samples were taken at the indicated times (minutes) and assayed for σB-dependent β-galactosidase activity (Miller units). The arrow indicates the time as which the cultures left exponential growth.
