HTR1A and schizophrenia: This is the first study to examine the profile of mRNA expression of the dopamine D1, D2, D3, and D4 and serotonin 5-HT1A, 5-HT2A, and 5-HT3A receptors in PBMCs in medicated patients with schizophrenia, and to perform an in vitro analysis of the effects of six major antipsychotics on the receptor expression in PBMCs.