GRM3 and schizophrenia: mGlu3 immunoreactivity was higher in men than women, both for the dimer (145 ± 38 vs. 127 ± 35; t = 2.94, d.f. 154, p = 0.004) and the monomer (205 ± 79 vs. 173 ± 68; t = 2.50, d.f. 154, p = 0.014); similar but non-significant differences were seen in the control and schizophrenia groups considered separately (data not shown).