1HSE:
reference: Mutagenesis of the histidine ligand in human lactoferrin: iron binding properties and crystal structure of the histidine-253-->methionine mutant., Nicholson H, Anderson BF, Bland T, Shewry SC, Tweedie JW, Baker EN, Biochemistry 1997 Jan 14;36(2):341-6. PMID: 9003186

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