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Mass spectra of the methyl esters of the unlabeled (a) and 13C-labeled (b) 4-Me-18:0 fatty acids recovered from cultures of strain AK-01 grown on unlabeled hexadecane and [1,2-13C2]hexadecane, respectively. Chemical structures of the fatty acids represented by the mass spectra are shown as insets. (Note: the mass spectrum for the 13C-labeled 4-Me-18:0 fatty acid indicates the coexistence of two isotopmers.)
