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Expression of TIMP-1, MMP-9 and COL IV in the hippocampus of rats following middle cerebral artery occlusion. **P<0.01 vs. sham group; ΔΔP<0.01 vs. model group; ##P<0.01 vs. SJZD high-dose group. SJZD, Sijunzi decoction; TIMP-1, tissue inhibitor of metalloproteinase 1; MMP-9, matrix metalloproteinase 9; COL IV, collagen IV.
