Fig. S4.

Dopaminergic innervation of the MLR in rats. (A) Schematic dorsal view of the rat brain. (Right) Diagram illustrating a cross-section at the level of the MLR with the approximate location of the photomicrograph shown in B. (B) Distribution of the MLR cells positive for ChAT in the PPN, considered part of the MLR in rats (2). (C and D) Fibers and varicosities immunoreactive for the DAT (red, D) in proximity with MLR cells positive for ChAT (green, C) in the PPN. (C–E) magnifications of the dashed rectangle in B. (E) Magnification of D. The arrows highlight examples of DAT (red) -containing fibers surrounding cholinergic cells (green) in the PPN.