Fig. 4From: Effect of injection of different doses of isoproterenol on the hearts of miceBar graphs showing the HR before administration (A), HR after dosing for 7 days (B), HR after 21 days (C). (D) Echocardiogram showing HR at 3 times in each group. Data shown are means ± SD; n = 6 in each group. *P < 0.05,significantly different as indicatedBack to article page