title: Ultrastructural changes in heart tissue during hibernation.
mesh_terms: D000818:Animals; D006605:Hibernation; D008055:Lipids; D008854:Microscopy, Electron; D009132:Muscles / Q000166:cytology; D009206:Myocardium / Q000166:cytology*; D012589:Sciuridae / Q000033:anatomy & histology*
chemical_list: D008055:Lipids