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Effects of claudin-4 overexpression on the level of expression of other claudins. RT-PCR analysis of claudin expression in each of the 3 OK stable cell lines expressing empty vector (black bars) or stable cell lines overexpressing claudin-4HA (n = 4). Gene expression is represented as percentage of control (OK cells stably expressing pcDNA 3.1+) and normalized to the expression of GAPDH. Data are presented as means ± SE; n ≥ 3 for each group. *P value < 0.05.
