Gene expression levels and distribution of regulatory motifs for the genes differentially expressed after parasitoid attack. (a) Expression levels for genes (rows) at different sample time points (columns: 1-9 parasitized larvae; 10-18 unparasitized larvae). The expression levels are given as multiples of the median for that gene, using a color code illustrated at top right. At the left the dendrogram produced by the clustering algorithm is shown, with the 16 clusters discussed in the text depicted in different colors (with their code numbers; the final column on the right shows the clusters again using the same color key). (b) The distribution of putative regulatory motifs in the -1,000 to +50 base pair upstream regions of the genes. The colors indicate the number and strength of the matches for each motif (see code on upper right, in which a score of 0 is equivalent to no matches, 10 is equivalent to one strong or two weak matches, and 20 is equivalent to multiple strong matches).