This notion is further supported by reported aberrant expression levels of DLG4 encoding PSD95, DLG1 encoding SAP97 and PICK1 encoding PICK1 (Protein interacting with C-kinase-1), in post mortem brain samples from schizophrenia patients, indicating defective glutamate receptor targeting and downstream signaling in schizophrenia [14], [15]. This evidence concerns the gene PICK1 and schizophrenia.