Circular mDNAs 26.85 and 26.94 kb in length were isolated from two isogenic strains of A. chrysogenum producing cephalosporin C. The strains differed in antibiotic production capacity. Restriction analysis of the mDNAs was performed with using 6 endonucleases. Comparison of the restriction data revealed identity of mDNAs. A restriction map of the mDNAs was constructed. It is useful as a basis for further studies with molecular cloning.
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