title: Mental retardation, marker X chromosomes, and silver-staining (NORs).
mesh_terms: D002466:Cell Nucleolus / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D012730:Sex Chromosomes; D012834:Silver; D013194:Staining and Labeling; D014960:X Chromosome
chemical_list: D012834:Silver