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Phylogenetic tree demonstrates responders in our data set for both xylose and cellulose (Fig 4). Depicts the there are very few OTUs that utilize both cellulose and xylose.   "The genetic potential to produce extracellular enzymes involved in the degradation of rela- tively labile forms of C, including most abundant plant structural C polymers such as cellulose and hemicellulose, seems to be less conserved among different phylum of the soil bacteria (\cite{Zimmerman_2013},\cite{Trivedi_2013}) . However, the number of genes per genome involved in the degradation of moderately labile C seems to be higher in typical soil-inhabiting bac- teria belonging to Actinobacteria and Acidobacteria as compared to most of the Proteobacterial members (Figure 2) [56]" \cite{Berlemont_2013} \cite{Berlemont_2013}, \cite{Trivedi_2013}.  \textbf{Carbon substrate utilization is inconsistent within phylum.} Due to the evidence of clade or single taxa level responses for xylose and cellulose utilization, assigning phylum level functionality is not an accurate depiction of substrate utilization. Despite that, we often see functionality assigned at the phylum level (refs). This could in part be due to limitations in finer scale taxonomic identifications or to lack of sequencing resolution as seen with the cellulose responders.