1FHK:
reference: Structure and function of the conserved 690 hairpin in Escherichia coli 16 S ribosomal RNA. II. NMR solution structure., Morosyuk SV, Cunningham PR, SantaLucia J Jr, J Mol Biol 2001 Mar 16;307(1):197-211. PMID: 11243814

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