The studies of the mechanisms of arrhythmogenesis and the action of antiarrhythmic drugs have already focused on the events of ionic channel currents in isolated single heart cells.
而对心律失常发生机制及药物抗心律失常作用机制的研究，也都聚焦于对心肌细胞离子通道及跨膜离子流的研究。
Until now, the tiny clump of the heart cells about the size of a poppy seed has been still. But after 22 days a single cell stirs as it jolted to life.
现在暗红色的心肌细胞还是静止的，但是在22天后就会有一个细胞动起来，它开始有了生命。
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