RESULTS: A total of 68 thoracic aortas rings were obtained from 17 enrolled rats, 8 of which were excluded for disqualification, and the rest 60 rings were used in the experiment.

• 结果:纳入大鼠17只,共取得胸主动脉环68个,共8个不合格予以剔除,其余60个胸主动脉环均用于实验。