The most represented functional categories among the genes differentially expressed in Cx and Ox. The complete set of unigenes was grouped into functional categories using the MIPS database. Those categories with a total number of unigenes over 10 were considered as the most represented. The total number of unigenes is shown between brackets following the category name. The number of unigenes up-regulated in Cx is represented as black bars, and the number of unigenes up-regulated in Ox is represented as grey bars.