title: Comparative study of chromosomal structure.
mesh_terms: D000818:Animals; D002417:Cattle; D002875:Chromosomes / Q000648:ultrastructure*; D004330:Drosophila; D006657:Histones / Q000032:analysis; D008099:Liver / Q000648:ultrastructure; D008297:Male; D051379:Mice; D008854:Microscopy, Electron; D010944:Plants / Q000648:ultrastructure; D011894:Rana pipiens; D012469:Salivary Glands / Q000648:ultrastructure; D013094:Spermatozoa / Q000648:ultrastructure; D013950:Thymus Gland / Q000648:ultrastructure
chemical_list: D006657:Histones