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p-FAK (green) and F-actin (red) co-stained in L929 cells for PU film, aligned 3D porous PU6, aligned 3D porous PU14 and random porous scaffold of 14 wt% after culture for 8 days. Nuclei of cells were stained with dapi, blue; F-actin of cells were stained with rhodamine, red; p-FAK of cells were stained with green
