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Keratin 8 mRNA levels in MCF-7, SK-BR-3, T-47D, and MCF-10A cells. The expression levels of Keratin 8 mRNA were quantified by real-time RT-PCR and normalized to the housekeeping gene β-actin. Results are expressed as the ratio relative to Keratin 8 mRNA level in MCF-10A cells. All data are presented as the means ± SD of three independent experiments. *p < 0.01 versus MCF-10A by Student’s t-test.
