GRM1 and schizophrenia: mGluR1 monomer levels were significantly associated with Tamalin in control subjects (r=0.500, P=0.029) but not schizophrenia subjects, whereas mGluR1 total levels were associated with Tamalin in schizophrenia subjects (r=0.526, P=0.036), but did not reach significance in controls (r=0.463, P=0.061).