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A GENETIC APPROACH TO THE BIOSYNTHESIS OF THE RIFAMYCIN-CHROMOPHORE IN NOCARDIA-MEDITERRANEI .3. ISOLATION AND IDENTIFICATION OF AN EARLY AROMATIC ANSAMYCIN-PRECURSOR CONTAINING THE 7-CARBON AMINO STARTER-UNIT AND 3 INITIAL ACETATE-PROPIONATE-UNITS OF THE ANSA CHAIN
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JOURNAL OF ANTIBIOTICS,
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