GO enrichment analysis of DEPs. Panel A to D represent the compared groups of day 6 vs day 3, day 9 vs. d3, day 12 vs. d3 and day 16 vs. d3. To the left of each plot: GO terms. Above each plot: -log10 (p-value). Yellow bars indicate cellular component, red bars represent a biological process, and blue bars denote a molecular function.