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After adding the organic matter amendment to soil, we tracked the flow of  $^{13}$C from $^{13}$C-xylose or $^{13}$C-cellulose into microbial DNA over  time using DNA-SIP (Figure~\ref{fig:setup}). The amendment consisted of  compounds representative found in  of plant biomass including cellulose, lignin, sugars found in hemicellulose, amino acids, and inorganic nutrients (see Supplemental  Information (SI)). The amendment was added at~2.9 mg C g$^{-1}$ soil dry weight  (d.w.), and this comprised 19\% of the total C in the soil. The cellulose-C