1NAT:
reference: A response regulatory protein with the site of phosphorylation blocked by an arginine interaction: crystal structure of Spo0F from Bacillus subtilis., Madhusudan M, Zapf J, Hoch JA, Whiteley JM, Xuong NH, Varughese KI, Biochemistry 1997 Oct 21;36(42):12739-45. PMID: 9335530

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