title: Microgravity changes in heart structure and cyclic-AMP metabolism.
mesh_terms: D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006112:Gravitation; D008297:Male; D009206:Myocardium / Q000378:metabolism / Q000648:ultrastructure*; D051381:Rats; D013026:Space Flight
chemical_list: D000242:Cyclic AMP