Figure 3From: Whole-genome expression profile in zebrafish embryos after chronic exposure to morphine: identification of new genes associated with neuronal function and mu opioid receptor expressionFunctional categories and number of genes found to be modified by morphine in each category. (A) Functional categories of genes found to be associated with the exposure to morphine in zebrafish embryos. Numbers following the category names indicate the number of genes in the category, and those in parentheses are the corresponding percentages. (B) Number of genes (up-, in blue, and down-regulated, in red) by functional category. For the full list of genes, see Table 2 and Additional file 4.Back to article page