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Fig. 3. Ribbon diagram showing two views of the E.coli HPr–IIAGlc complex. HPr is in green, IIAGlc in blue and the location of the active site histidines, His15 of HPr and His90 of IIAGlc, is indicated. Residues from HPr are denoted in italic. The secondary structure elements in the vicinity of the interface are indicated.
