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Schematic of the biosynthesis of the tenellin-related compounds. The scheme shown in square brackets for tenellin biosynthesis was suggested previously (20). The question marks indicate that the involved enzymes or pathways remain unclear. The compounds labeled in blue are known products reported previously, while those labeled in red are novel chemicals identified in this study. Pretenellins A and B were not detected in this study. SAM, S-adenosylmethionine; CoA, coenzyme A.
