This gene is a homeobox-containing gene expressed during development. The expressed protein contains two conserved domains, a C-peptide (or aristaless domain) and the prd-like class homeobox domain. It is a member of the group-II aristaless-related protein family whose members are expressed primarily in the central and/or peripheral nervous system. This gene is thought to be involved in CNS development. Expansion of a polyalanine tract and other mutations in this gene cause X-linked mental retardation and epilepsy.,ARX,CT121,EIEE1,ISSX,MRX29,MRX32,MRX33,MRX36,MRX38,MRX43,MRX54,MRX76,MRX87,MRXS1,PRTS,Epigenetics & Nuclear Signaling,Transcription Factors,Neuroscience,Dopamine Signaling in Parkinson's Disease,Neurodegenerative Diseases Markers,ARX