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Schematic drawing comparing the asymmetric (presumed excitatory) synapses in white and symmetric (presumed modulatory/inhibitory) synapses in black formed by cholinergic axons presumably coming from the mesopontine tegmentum onto identified cell populations of DA (D) and GABA (G) VTA neurons. The thickness of cholinergic axons is weighted to reflect the approximate frequency of the connections observed in the present study.
