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. 2014 Jul 23;9(7):e103306. doi: 10.1371/journal.pone.0103306

Figure 3. Innervation of melanopsin-expressing retinal ganglion cells (mRGCs) in the rostral periaqueductal gray (rPAG).

Figure 3

(A) Coronal section of an injection site. (B–D) Arrow points to a CTB retrogradely labeled rPAG-projecting RGC. This cell was also positive for melanopsin immunoreactivity (C), but not all mRGCs could be retrogradely labeled by CTB (arrowhead in C and D). bsc: the brachium of the superior colliculus; PiRe: pineal recess; pc: posterior commissure; rPAG: the rostral periaqueductal gray. Scale bars: 300 µm in A; 20 µm in D (applies to B and C).