Genes enriched in even-numbered rhombomeres (r2 and r4). (A-J) The normalised expression value is represented graphically for each rhombomere +/- SEM. (A'-J') Hindbrain flat mount preparations of in situ hybridisations of the corresponding gene. Arrows mark the enriched sites of expression in the r2 and r4 territories. The genes were selected for verification based upon their molecular functions and predicted expression profiles. Generally, the expression profile is consistent with that predicted by the microarray data.