These 3 genes were all related to ‘schizophrenia,’ ‘alcoholism,’ ‘mood disorders’, and ‘panic disorder,’ but ‘autistic disorder,’ ‘major depression,’ and ‘bipolar disorder’ were only related to 5-HTT and MAOA. Thus, these mental disorders may also be related to CCK, which must be further analyzed. This evidence concerns the gene SLC6A4 and autism.