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C-signal dependence of a 5′-deleted Ω4499 promoter region. Developmental lacZ expression of pDY103 integrated at attB of wild-type DK1622 (⧫) or csgA mutant DK5208 in the absence (Δ) or presence (▴) of an equal number of wild-type DK1622 cells (lacking lacZ but capable of C signaling). The meaning of points and error bars is the same as described in the Fig. 1 legend.
