Beta-3 adrenergic receptor agonists cause an increase in gastrointestinal transit time in wild-type mice, but not in mice lacking the beta-3 adrenergic receptor.
Fletcher DS, Candelore MR, Grujic D, Lowell BB, Luell S, Susulic VS, Macintyre DE. Beta-3 adrenergic receptor agonists cause an increase in gastrointestinal transit time in wild-type mice, but not in mice lacking the beta-3 adrenergic receptor. J Pharmacol Exp Ther. 1998 Nov; 287(2):720-4.