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Mass spectra of the putative silylated metabolite methylpentadecylsuccinic acid from AK-01 cultures incubated with protonated hexadecane (A), AK-01 cultures incubated with d34-hexadecane (B), and the sulfate-reducing consortium incubated with [1,2-13C2]hexadecane (C). Chemical structures represented by the mass spectra are shown in insets. *, 13C-labeled carbon atoms.
