5XOX:
reference: Crystal structure of tRNAHis guanylyltransferase from Saccharomyces cerevisiae., Lee K, Lee EH, Son J, Hwang KY, Biochem Biophys Res Commun. 2017 Aug 19;490(2):400-405. doi:, 10.1016/j.bbrc.2017.06.054. Epub 2017 Jun 13. PMID: 28623126

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