Fig. 2.

Functional classification of quantified proteins. Quantified proteins were categorized into functional categories (gray bars) according to JCVI annotations. The numbers of proteins showing differential protein abundance in acetate/glucose or propionate/glucose comparisons are indicated by black shading within the bar for each functional category. Under the hypergeometric distribution, only two functional categories (“Energy Metabolism” and “Transport and Binding proteins”, labeled with an asterisk) were significantly enriched (false discovery rate of 5%) in the subpopulation of differentially abundant proteins in comparison with the total population of quantified proteins.