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Fig. 2. Short P pili are assembled without the Cpx signaling pathway when expressed behind an inducible promoter. (A) Negative stain of wild-type cells expressing P pili behind the trc promoter (MC4100/pFJ29) at a magnification of 50 000. (B) Negative stain of cells with a cpxR null allele expressing P pili behind the trc promoter (TR51/pFJ29) at a magnification of 50 000. The bar represents 200 nm.
