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MS1 spectra of metabolite ions, identified by MetExtract II in the native/uniformly 13C labeled 1 + 1 mixed supernatant samples of strains #1290 and #1291 after cultivation in liquid minimal medium. (A) the spectrum for [M + H]+ and [M + Na]+ ions of C29H44O8 and (B) the spectrum for [M + H]+ and [M + Na]+ ions of C29H42O7, confirming the number of carbon atoms contained to be 29 in both cases.
