CDH17 and neurodevelopmental disorder: The differential expression of classical cadherins and protocadherins, the largest groups within the cadherin superfamily, suggests that they play important roles in the development of neural circuitry (Weiner and Jontes, 2013; Hirano and Takeichi, 2012), an idea supported by their involvement in a range of neurodevelopmental disorders (Redies et al., 2012; Hirabayashi and Yagi, 2014).