Figure 2.

Region of prefrontal cortex in which immunoreactive profiles were quantified. The brightfield photomicrograph on the left shows a representative section through the frontal cortex at the level of the areas of prefrontal cortex in which immunoreactive cells were quantified. The region of interest in which cells were counted in the medial prefrontal cortex is drawn as a polygon that covers the prelimbic and infralimbic cortex. The region of interest in which cells were counted in the orbitofrontal cortex is drawn as a circle. The photomicrograph is juxtaposed to the representative section from the Rat Brain Atlas (Swanson, 1992). CG1, cingulate cortex; Cl, claustrum; IL, infralimbic cortex; LO, lateral orbitofrontal cortex; Pir, piriform cortex; PrL, prelimbic cortex; VO, ventral orbitofrontal cortex.