2A4N:
reference: Structures of aminoglycoside acetyltransferase AAC(6')-Ii in a novel crystal form: structural and normal-mode analyses., Burk DL, Xiong B, Breitbach C, Berghuis AM, Acta Crystallogr D Biol Crystallogr 2005 Sep;61(Pt 9):1273-9. Epub 2005, Aug 16. PMID: 16131761

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