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Human dermal fibroblasts were cultured on (a) CS, (b) CS+0.5%CN, (c) CS+1%CN, (d) CS+5%CN, (e) CS+10%CN, (f) CS+20%CN, (g) CS+30%CN film matrices, and (h) cultural polystyrene surface (control) for 4 days. Original magnification 200X, phase-contrast light microscopy, scale bar represents 50 μm.
