Klinefelter syndrome, NRXN1 deletion, and 15q11.2 deletion syndrome are associated with ASD and ADHD;[93, 94, 95]NRXN1 deletion and 15q11.2 deletion syndrome[65, 99, 108] are also associated with developmental delay and schizophrenia. This evidence concerns the gene NRXN1 and Klinefelter syndrome.