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13C-labeling patterns of the PLFAs of soil samples incubated under 10 to 50 ppmv of 13CH4 (filled bars) or under 225 ppmv of 13CO2 (open bars). Incubation with 13CO2 was only performed with samples MF and G 44F. For samples incubated with 13CH4, data are the mean of triplicates ± 1 standard error of the mean.
