CDH9 and autism spectrum disorder: In addition, CNTNAP2 (contactin associated protein-like 2) [Alarcon et al., 2008; Arking et al., 2008; Bakkaloglu et al., 2008] and cadherin 10 (CDH10) and 9 (CDH9) have been also associated with autism spectrum disorders [Wang et al., 2009].