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CpxRM199A can activate transcription at cpxP. β-Galactosidase activities were measured for PAD279 and PAD282 (A) and for PAD290 and PAD293 (B) grown in sodium phosphate-buffered LB broth at pHs 5.5 (gray bars) and 8.5 (black bars). The other target genes tested, including yihE-dsbA, spy, ppiA, and degP, behaved like cpxR (data not shown). All strains were grown as described in Materials and Methods.
