Figure 2

Temporal gene expression clustering. Genes with maximal expression above 2 RPKM, at least two-fold expression change and a mature transcript length ≥100b were clustered. Given these criteria, 12,895 genes were selected for clustering into 8 clusters. The cluster sizes are 1313, 3227, 2826, 1302, 1087, 900, 895 and 1345 for clusters from 1 through 8, respectively. The heatmap (A) and normalized expression profiles of cluster centroids (B) are shown. As clusters 3, 4, 6 and 7 show a rising profile during meiosis, 8 to 20dpp, these clusters were designated as meiotic clusters.