| http://www.w3.org/ns/prov#value | - Migration through a porous membrane and invasion through a matrigel coated porous membrane resulted in small differences in the majority of experiments, but these were not always consistent, thus precluding an interpretation.To further test the hypothesis that ??4 integrin is an important contributor to tumor metastases, we injected control-shRNA or ??4 integrin-shRNA cells into the tail vein of R
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