Ontological analyses of the top 1,000 genes upregulated in E18.5 and E14.5 control kidneys. A. Molecular Function Level 1 analysis (annotation rates: E18.5 – 63.6%, E14.5 – 33.5%). B. Biological Process Level 2 analysis (annotation rates: E18.5 – 54.0%, E14.5 – 27.9%). C. Cell Component Level 4 analysis (annotation rates of the top 1,000 genes: E18.5 – 32.2%, E14.5 – 10.8%). Only molecule categories containing at least 3 hits in either of the gene lists are shown. The numbers of genes fell in major functional categories were normalized by the numbers of gene annotated in each list and were expressed in percentages.