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Mass spectra of silylated protonated and 1,2-13C2-labeled pentadecanoic acid (A) and protonated and 12,13-13C2-labeled tridecanoic acid (B) produced by the sulfate-reducing consortium incubated with [1,2-13C2]hexadecane. *, 13C atoms that have not been eliminated during degradation. The m/z values shown in parentheses correspond to the m/z values for those labeled metabolites.
