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Differences in miR-146b, miR-222, miR-21, miR-221, miR-181b expression levels between FFPE PTC tissue samples prepared in 2003, 2004 (n = 46) and 2008, 2009 (n = 31) when normalized with different ECs: a RNU48, b miR-16 and c let-7a. Relative expression of miR-181b shown in the graphs was multiplied by 2000. All data are presented as the mean ± SD. *p < 0.05, **p < 0.01, and ***p < 0.001. ns not significant
