2CHE:
reference: Structure of the Mg(2+)-bound form of CheY and mechanism of phosphoryl transfer in bacterial chemotaxis., Stock AM, Martinez-Hackert E, Rasmussen BF, West AH, Stock JB, Ringe D, Petsko GA, Biochemistry 1993 Dec 14;32(49):13375-80. PMID: 8257674

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