propranolol animal experiment 62 rat 62 Animal 60 Rats 60 nonhuman 54 Male 52 Support, Non-U.S. Gov't 52 phentolamine 50 noradrenalin 48 Propranolol 44 Rats, Inbred Strains 38 Female 36 Norepinephrine 36 beta adrenergic receptor 36 article 34 isoprenaline 34 Receptors, Adrenergic, beta 32 animal cell 32 priority journal 32 radioisotope 32 alpha adrenergic receptor 28 drug efficacy 28 in vitro study 26 Animals 24 Isoproterenol 24 Myocardial Contraction 24 autonomic nervous system 24 endocrine system 22 Receptors, Adrenergic, alpha 20