Optical density values were measured using Scion Image (NIH, MD) from digitalized images with a resolution of 300 dpi and converted to DPM (disintegrations per minute)/mg by reference to co-exposed C14 standards (American Radiolabeled Chemicals, St. Louis, MO). Measurements were taken within discrete amygdala subnuclei (Fig. 1) according to published sources of the human amygdala (25, 26). DPM/mg values from duplicate slides were averaged.
