Figure 13. Upper panel presents the mean-difference plot associated to the differential residual over-dispersion test between somitic and pre-somitic cells. Differences of residual over-dispersion in somitic cells relative to pre-somitic mesoderm cells are plotted against average expression estimates combined across both groups of cells. Bottom panel presents the volcano plot associated to the same test. Differences of residual over-dispersion in somitic cells relative to pre-somitic cells are plotted against their associated tail posterior probabilities. Colour indicates the differential expression status for each gene, including a label to identify genes that were excluded from differential expression test due to low ESS.