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Immunofluorescence staining of nuclear c-Fos in the neurons of the olfactory bulb (a, d, g, and j), piriform cortex (b, e, h, and k), and periaqueductal gray (c, f, i, and l) 90 minutes after X. laevigata leaf essential oil (EOX) intraperitoneal injection at doses of 0 (saline control), 12.5, 25, and 50 mg/Kg, respectively, on these three brain regions of the animals submitted to carrageenan hypernociception model.
