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(a) Stability of the collagen gel matrix between S-shaped (top) and straight pillars (bottom). White arrowhead points towards the gel-fluid boundary. Bar 100 μm. (b) Diffusion of 10 kDa fluorescently labelled dextran. The images were collected with a confocal laser scanning microscope. Bar 200 μm. (c) Evolution of the fluorescent intensity profiles with time.
