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Distribution of c-Fos immunoreactivity within the PAG following the SR test. Each of the bars represents 100% of the c-Fos-labeled neurons and the shaded areas represent the distribution among the longitudinal columns of the PAG. Following the SR test, brains of rats that went through the EU extinction procedure contained proportionally more c-Fos-labeled cells in the dlPAG than in other longitudinal columns of this midbrain structure.
