title: [An ultrastructural observation on the effect of L-thyroxin on rabbit myocardium].
mesh_terms: D000818:Animals; D006321:Heart / Q000187:drug effects*; D006651:Histocytochemistry; D009206:Myocardium / Q000648:ultrastructure; D011817:Rabbits; D013385:Succinate Dehydrogenase / Q000032:analysis; D013974:Thyroxine / Q000633:toxicity*
chemical_list: D013385:Succinate Dehydrogenase; D013974:Thyroxine