title: On the gates of hell and a most unusual gene.
mesh_terms: D005600:Fragile X Syndrome / Q000235:genetics*; D008040:Genetic Linkage; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D009154:Mutation; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D014960:X Chromosome