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Observation of the human chondrosarcoma cells (A-E) and of primary cells (F-J) by microscopy (×20 objective, scale bar is 100 μm). The cells have been cultured for five days on native films (A, F), cross-linked films (B, G) and films ending by ∼ PGA-mannose (C, H), ∼ PGA-lactose (D, I) as compared to bare glass (E, J).
