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Dentate gyrus of control (a), L-arginine (b), L-carnitine (c) and fipronil (FPN)-treated rats (d). FPN-treated rat (d) showed shrunken, darkly stained granule cells with cytoplasmic vacuolations among few nearly normal granules cells with large vesicular nuclei. Improvements were observed in FPN + L-arginine and FPN + L-carnitine-treated groups (e,f). Stain: Hematoxylin and Eosin (H&E), magnification 400×.
