4LAB:
reference: The mechanism of pseudouridine synthases from a covalent complex with RNA, and alternate specificity for U2605 versus U2604 between close homologs., Czudnochowski N, Ashley GW, Santi DV, Alian A, Finer-Moore J, Stroud RM, Nucleic Acids Res. 2013 Nov 7. PMID: 24214967

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