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Comparison of the structure of the DHp domain of PhoR with those of HK853 (PDB id 2C2A) and CpxA (4BIX). The side chains of the phosphorylation site histidine are shown in sticks. The two α1 helices of each structure are in equivalent positions relative to each other. Subunits with the equivalent α1 helix are labeled and colored identically, subunit A in green and B in blue.
