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Outer membrane proteins of the ompR234 strain PHL644 (lanes A and C) and the wild-type strain PHL645 (lanes B and D). Bacteria were grown to mid-log phase at 30°C in MOPS medium (lanes A and B) or in MOPS medium with 300 mM NaCl (lanes C and D). Equal amounts of each membrane fraction protein were separated by 6 M urea–SDS-PAGE.
