Fig. 3

HPLC chromatograms of N50 (upper) and N50 mutant (bottom) solvent extracts. Each solvent extract was prepared via ethyl acetate after 7 days of incubation in 20 mL of YME medium. The chromatograms were recorded at 310Â nm. The six peaks at the dotted positions are the newly identified 15-deoxynaphthomycins