AFF2 and Intellectual disability: A number of genes causing mental retardation, for example MECP2 (OMIM +300005) [18], NDP (OMIM+310600) [23], FMR2 (OMIM +309548) [24], or SLC6A8 (OMIM *300036) (this work) have already been reported to have elevated expression in these brain regions compared to other areas of the brain (see table 1).