Lateral habenula (LHb) neurons are activated by negative motivational stimuli and play key roles in the pathophysiology of depression. Prior reports suggested that rostral entopeduncular nucleus (rEPN) neurons drive these responses in the LHb and rostromedial tegmental nucleus (RMTg). but these influences remain untested. Using rabies viral tracers. https://www.roneverhart.com/SERPENT-CARBON/