title: Drosophila melanogaster has different ribosomal RNA sequences on S and Y chromosomes.
mesh_terms: D000818:Animals; D001483:Base Sequence; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D005796:Genes; D008297:Male; D009697:Nucleolus Organizer Region; D012335:RNA, Ribosomal / Q000235:genetics*; D012730:Sex Chromosomes; D014960:X Chromosome; D014998:Y Chromosome
chemical_list: D012335:RNA, Ribosomal