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Western blot analysis of the effects of metformin on the (A and B) ERK1/2/AMPK and the (C and D) UPR in PC12 cells. *P<0.05, **P<0.01, ***P<0.001. The data are presented as the means ± SD; n=6 for each subgroup. D-gal, D-galactose; Met, metformin; U, U0126; CC, compound C.
