4OK0:
reference: Crystal structure of JHP933 from Helicobacter pylori J99 shows two-domain architecture with a DUF1814 family nucleotidyltransferase domain and a helical bundle domain., Yoon JY, Lee SJ, Kim DJ, Lee BJ, Yang JK, Suh SW, Proteins. 2014 Mar 27. doi: 10.1002/prot.24572. PMID: 24677396

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