Interestingly, the predicted targets of cluster 5 include the gamma-aminobutyric acid B receptor 2 (Gabbra2), the galanin receptor 1 (GalR1) and the glutamate receptor ionotropic AMPA 2 (Gria2), all genes whose products are implicated in the regulation of excitability and in epilepsy. Here, GALR1 is linked to epilepsy.