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Tetrocarcin A-biosynthetic (tca) gene cluster of M. chalcea NRRL 11289 (a) and t1pks-1 gene cluster of Micromonospora sp. TP-A0316 (b); ACP, acyl carrier protein; AT, acyltransferase; DH, dehydratase; ER, enoyl reductase; KR, ketoreductase; KS, ketosynthase; LM, loading module; M, module. Domain organizations are shown below ORFs.
