1VFE:
reference: Mutation of arginine 121 in lactoferrin destabilizes iron binding by disruption of anion binding: crystal structures of R121S and R121E mutants., Faber HR, Baker CJ, Day CL, Tweedie JW, Baker EN, Biochemistry 1996 Nov 19;35(46):14473-9. PMID: 8931543

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