RAC1 and autism: Our results of increased expression of RAC1 in the cerebellar vermis and BA9 of adults with autism, and in BA9 of children with autism, are novel and have never previously been reported in human postmortem brains of subjects with autism; they may be the result of reduced expression of FMRP in the same regions [30,31], and they mirror the same findings in Fmr1 KO mice.