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Photomicrographs of sections in the frontal area of cerebral cortex (EPL) (P-CREB immuno-staining, ×400). (A) of a rat in group 1 showing multiple +ve nuclei of neurons (arrows). (B) of a rat in group 2 showing few +ve nuclei of neurons (arrows). (C) of a rat in group 3 showing some +ve nuclei of neurons (arrows). (D) of a rat in subgroup 4a showing multiple +ve nuclei of neurons (arrows). (E) of a rat in subgroup 4b showing multiple +ve nuclei of neurons (arrows).
