BDNF and dyslexia: These genes include nNOS, or NOS1, which encodes a neuronal nitric oxide synthase that produces NO, which in turn acts as a neurotransmitter and regulates synapse formation [36]; NTRK2, which encodes neurotrophic receptor tyrosine kinase 2, TrkB, which binds BDNF; CLSTN2 (Calsyntenin 2), which encodes a postsynaptic adhesion molecule involved in synapse formation [37]; and CNTNAP5, which encodes contactin-associated protein family member 5 and is associated with dyslexia [38] and SZ [39].