Phylogenetic position of cellulose responders and xylose responders in the
context of all OTUs that passed sparsity independent filtering criteria (see
Methods). Only those phyla that contain responders are shown.  Colored dots are
used to identify xylose responders (green) and cellulose responders (blue). The
heatmaps indicate enrichment in high density fractions relative to control
(represented as LFC) for each OTU in response to both $^{13}$C-cellulose
(13CCPS, leftmost heatmap) and $^{13}$C-xylose (13CXPS, rightmost heatmap) with
values for different days in each heatmap column. High enrichment values
(represented as LFC) provide evidence of $^{13}$C-labeled DNA.  

