CDH2 and atrial fibrillation: N‐cadherin is downregulated during the development of the sclerotome (Duband et al., 1987) and AF tissue (Minogue et al., 2010; Risbud et al., 2015; Sakai et al., 2009), even though N‐cadherin is required for the initial formation of the somite, of which the sclerotome is a part (Duband et al., 1987).