title: X doesn't always mark the spot.
authors.affiliation: MBE Press Office.
authors.forename: Joseph
authors.initials: J
authors.lastname: Caspermeyer
mesh_terms: D000818:Animals; D005260:Female; D015870:Gene Expression; D050172:Genes, X-Linked; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male; D049951:X Chromosome Inactivation