Figure 5From: Up-regulation of miR-224 promotes cancer cell proliferation and invasion and predicts relapse of colorectal cancerMiR-224 down-regulates SMAD4 protein expression but not mRNA level. (A) The expression of SMAD4 mRNA was analyzed by qRT-PCR assay. (B) The expression of SMAD4 protein was analyzed by western blot assay. **P<0.01.Back to article page