They essentially turn the whole SA node into your natural pacemaker.

它们本质上将整个 SA 节点变成你的自然起搏器。

The gene changed heart muscle cells -- called cardiomyocytes -- into natural pacemaker cells.

该基因将心肌细胞（称为心肌细胞）转变为天然起搏细胞。

This is the natural pacemaker of the heart.

这是心脏的自然起搏器。

Sinus rhythm is the normal rhythm of the heart set by its natural pacemaker in the SA node.

窦性心律是SA结中自然起搏器设定的心脏正常节律。