Andersson et al development 2006
D EV EL O PM EN T 507RESEARCH ARTICLE INTRODUCTION The mesencephalic dopaminergic (mesDA) neurons have been studied extensively owing to their involvement in Parkinson’s disease, as well as in psychiatric and affective disorders. The mesDA neurons are located in the substantia nigra (SN, cell group A9), the ventral tegmental area (VTA, cell group A10) and the retro-rubral area (RRA, cell group A8)