Probe-sets and genes differentially expressed by chronic morphine treatment in zebrafish embryos. Identified probe sets in comparison with total probes on the microarray (A) and detail of identified probe sets up- and down-regulated (B). (C): Number of identified genes (known and unknown). (D) Number of known genes and detail of genes up-, down- and up-/down-regulated. (E): Number of identified genes with a fold change (FC) of at least 1.3. Numbers following the category names indicate the number of probe-set or genes. For the full list of probe-set/genes, see Additional file 1.