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A, choline acetyltransferase (ChAT)-immunopositive neurons in a section of the medial septum (MS) from sham-operated control rats. B, fewer ChAT-positive neurons are visible in a section of the MS region after injection of 192 IgG-saporin. C and D, higher magnification of images depicted in A and B, respectively. Scale bar B = 0.25 mm; D = 0.125 mm.
