PsychiatryOnline | American Journal of Psychiatry | Effects of Schizophrenia Risk Variation in the NRG1 Gene on NRG1-IV Splicing During Fetal and Early Postnatal Human Neocortical Development By SupremePundit | September 16, 2014 0 Comment PsychiatryOnline | American Journal of Psychiatry | Effects of Schizophrenia Risk Variation in the NRG1 Gene on NRG1-IV Splicing During Fetal and Early Postnatal Human Neocortical Development.