The inflammatory cytokine IL-1β, which converts rat mesencephalic progenitor cells to a dopaminergic phenotype, and IL-6, which decreases serotonergic neuron survival in the fetal brain, both influence the development of neurotransmitter systems, especially those involved in schizophrenia (Müller and Bechter, 2013). This evidence concerns the gene IL1B and schizophrenia.