4EX7:
reference: Structural basis for C-ribosylation in the alnumycin A biosynthetic pathway., Oja T, Niiranen L, Sandalova T, Klika KD, Niemi J, Mantsala P, Schneider G, Metsa-Ketela M, Proc Natl Acad Sci U S A. 2013 Jan 7. PMID: 23297194

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