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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: Neurosci Biobehav Rev. 2018 Apr 25;90:247–259. doi: 10.1016/j.neubiorev.2018.04.014

Figure 5.

Figure 5

A–B. Dark-field photomicrographs showing CRF-IR fibers in the caudal midbrain. A. Labeled fibers are densest in the retrorubral field (RRF, or A8) with fewer labeled fibers in the ventral tegmental area (VTA, A10). B. Higher power image of RRF (boxed area in A). IPN, interpeduncular nucleus. Scale bar= 250 μm.