Figure 4: Gene ontology analysis for under-expressed genes during postnatal liver maturation compared to day 60. (A) Heat map for GO categories with significant under-expression genes at ages of day −2, 1, 5, 20, and 25. The color represents the false discovery rate of each GO category. The numbers on the right are the cumulative number of GO categories. The three brackets B, C, and D identify groups of GO categories enriched at specific ages during postnatal liver maturation. Representative GO categories in each bracket are show in the corresponding panels of (B), (C), and (D).