title: Neural tube defects, sex ratios, and X inactivation.
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009436:Neural Tube Defects / Q000453:epidemiology / Q000235:genetics*; D012733:Sex Differentiation; D012744:Sex Ratio; D014960:X Chromosome / Q000502:physiology*