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Stereo view of the superimposed receiver domains of PhoP from B. subtilis (purple), PhoB from E. coli (pdb 1B00) (green), and DrrD from T. maritima (pdb 1KGS) (yellow). The superimposition of the structures was based on the best fit of the central five-strand sheet and revealed the similarities and differences in the protein folds. The conformations of the β4-α4 loops and α4 helices are not related in these three members of the OmpR family.
