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Fos/SP-positive cell distribution in the nuclei of the medulla oblongata in the HCl group. (A) Fos/SP-positive cells (white arrow) were primarily distributed in the DVC (including NTS and DMV), and a few cells were observed in the IRT and LRT. (B,C) Fos/SP-positive cells represent a large proportion of Fos- or SP-positive cells, especially in the DVC.
