4OX9:
reference: Molecular recognition and modification of the 30S ribosome by the aminoglycoside-resistance methyltransferase NpmA., Dunkle JA, Vinal K, Desai PM, Zelinskaya N, Savic M, West DM, Conn GL, Dunham CM, Proc Natl Acad Sci U S A. 2014 Apr 9. PMID: 24717845

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