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Collagen porosity measured with SEM. (a) SEM images of tumor (scale bar: 2 μm), and TIME (scale bar: 20 μm) cells morphologies (top panels), and collagen matrix organization (bottom panels, scale bar: 1 μm). (b) Collagen matrix porosity measurements calculated from SEM images of the ECM, *p<0.05, **p<0.01
