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Classification of differentially expressed genes involved in wing imaginal disc regeneration. According to the expression changes in early and late regeneration stages, genes in the transcriptomes were organized in four classes: Class I, genes with differential expression only in the first 24 hours; Class II, genes with differential expression only between 24 and 72 hours; Class III, genes with a significant difference between the two time periods; Class IV, genes with a sustained increase or decrease in their expression levels during regeneration. Intersections of upregulated genes (in red) and downregulated genes (in green) in a particular class are depicted using Venn diagrams. For each intersection, we display the number of genes and a generic pictogram representing the gene expression trend in C0→C24 and C24→C72.