Cx40,Cx43,Cx45,Cx37 and Cx46.Among them Cx40,Cx43,Cx45 is relatively abundant in cardiac muscle,Cx37 distributing to wall of cardiac vascular,a small quantity of Cx37 and Cx46 distributing to atrium or ventricle.

• 在心房或心室肌细胞中偶尔可发现微量的Cx37、Cx46。 Cx43除了窦房结、房室结、部分传导系统外，存在于整个心脏，Cx40表达在心房(小鼠心脏除外)和传导系统近端最强，Cx45局限于窦房结、房室结及传导系统。