title: Electron microscopic observation of nucleosomes in ultrathin sections of heparin-treated nuclei.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000187:drug effects / Q000648:ultrastructure*; D002843:Chromatin / Q000187:drug effects / Q000648:ultrastructure; D006493:Heparin / Q000494:pharmacology*; D066298:In Vitro Techniques; D008099:Liver / Q000187:drug effects / Q000648:ultrastructure; D008854:Microscopy, Electron; D051381:Rats
chemical_list: D002843:Chromatin; D006493:Heparin