Fig. 6

Essential expressed genes. Analysis showing the overlap between transcription level in core and essential genes. a Barplot showing the distribution of lowly, medium and highly transcribed genes of the essential genes of B. breve UCC2003 and the core genome of Bifidobacterium compared to the whole transcriptome (total of genes). The chart also illustrates the overlap between the core and essential transcribed genes in this organism. b Stacked-column plot showing the percentage of essential (blue) and total (red) expressed genes organized by COG categories. The plot displays how housekeeping COG categories (e.g. translation, ribosomal structure and biogenesis as well as RNA processing and modification) are the most represented in our dataset