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Amphi-enterobactin (aeb) gene cluster. Proposed sources of fragments and breakdown products due to direct biosynthesis/premature release (step a) or degradation (step b) are shown. Genes are color coded: red, long-chain fatty-acid CoA ligase; blue, DHBA biosynthesis; green, NRPS; brown, P-pant transferase; gray, hypothetical protein; after ref. 21.
