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treatment (top) and xylose treatment (bottom). Log$_{2}$ fold change is based  on the relative abundance in the experimental treatment compared to the control  within the density range 1.7125-1.755 g ml$^{-1}$. Taxa are  colored by phylum. The last column shows the distribution of all fold change values in each row. The darker  gray band represents one standard deviation and the lighter band represents two standard deviations  about the mean of all fold change values for both treatments.