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Cytotoxicity of ZZCD, ZZ, DDC (A), and glutamate (B) in PC12 cells. Protection of ZZCD, ZZ, DDC (C), and fluoxetine (D) in glutamate-induced cytotoxictiy in PC12 cells. ## p < 0.01 vs. control. *p < 0.05 and **p < 0.01 vs. cells treated with glutamate alone (n = 3). ♦ p < 0.05 vs. cells treated with the other two group (ZZCD, ZZ, or DDC).
