Figure 4

Genes grouped by gene ontology (GO) terms. For all statistical significance categories, the bars in the reference set plot the subset frequencies of annotated genes in the cDNA microarrays belonging to a particular class with valid gene expression data for statistical analysis (Fig. 1), and the bars in the dataset represent those frequencies in the group of genes labeled as 'differentially expressed' when contrasting the two extreme thermal regimes. Two categories are apparently underrepresented (organic acid and carboxylic acid metabolism), whereas the rest are overrepresented in the dataset [see Additional file 2].