Fig. 7.
Summary of the effects of opioids on granule neuron development. Activation of μ opioid receptor activation inhibited the proliferation of granule neuronal precursors, while activation of preferential δ2 agonists inhibited neuronal differentiation. Granule neurons did not express κ opioid receptors. Opioids did not affect neuronal viability. Whether opioids affect migration was not assessed.