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(A and B) Stereoviews of superpositions of the α-carbon backbone of E. coli apo-CheY (7) (open bonds) and CheY-A and CheY-B of the heterodimers (solid bonds), respectively. Superpositions were based on the most similar regions, which were residues 2–40, 85–95, and 100–129 for apo-CheY and CheY-A and residues 2–35, 50–70, and 100–129 of apo-CheY and CheY-B.
