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Carbocisteine inhibited TNF-α-induced ERK1/2 activation in A549 cells. (A) Representative Western blots of pERK1/2, total ERK1/2 and GAPDH. (B) Histograms represent the means and SD of the ratio of pERK1/2 protein bands normalized to the GAPDH protein. Mean±SD. n=3. *P<0.05, **P<0.01 compared with the TNF-α group.
