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Matrigel invasion assay. (A–D) Phase contrast images of cells on Matrigel layer at indicated time-points; scale bar: 100 μm. (E) Endogenous collagenases activity indirectly measured by fluorescence emitted by DQ™ Gelatin degradation at indicated time-points. Data represent mean of three independent experiments ± S.D. **P < 0.01.
