CALM3 and familial long QT syndrome: Recently, mutations in the highly conserved calcium (Ca2+)‐sensing protein calmodulin (CaM) have been associated with LQTS (Boczek et al., 2016; Chaix et al., 2016; Chazin & Johnson, 2020; Crotti et al., 2013; Crotti et al., 2019; Fujita et al., 2019; Hussey et al., 2023; Jensen et al., 2018; Jimenez‐Jaimez et al., 2016; Makita et al., 2014; Reed et al., 2015; Schwartz et al., 2020; Wren et al., 2019).