Fig 4. Growth phase-dependent expression of enzymes involved in acetate and butyrate fermentation.

Proteins involved in the fermentation pathways shown were identified in this study, with enrichment of acetate fermentation (A) during exponential phase growth, and butyrate fermentation (B) during stationary phase growth. All enzymes in these pathways were identified across all strains and in both medium types examined, and expression patterns are shown in the heat map on the right hand side for each enzyme identified in the pathways. Blue shading indicates lower protein expression, yellow shading represents higher protein expression, and gray indicates that the protein was not observed in the sample. Protein expression data from all cell fraction samples are included in the heat map, shown from left to right as columns in the heat map.