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(A) Chemical structure of chromomycin A3. Sugars: A, 4-O-acetyl-d-oliose; B, 4-O-methyl-d-oliose; C and D, d-olivose; E, 4-O-acetyl-l-chromose B. (B) Genetic organization of the chromomycin biosynthesis gene cluster. Glycosyltransferase genes are in gray. B, BamHI sites.
