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MMP-9 expression in the hippocampus of rats following middle cerebral artery occlusion. Brownish yellow particles were observed in the nucleus or cytoplasm; arrows indicate positive MMP-9 expression. Representative immunohistochemistry images of the (A) sham, (B) model, (C) nimodipine, (D) SJZD low-dose, (E) SJZD medium-dose and (F) SJZD high-dose groups. Scale bar, 50 µm; magnification, ×400. SJZD, Sijunzi decoction; MMP-9, matrix metalloproteinase 9.
