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Phase contrast microscopy. (A) Week 1: similar morphology on all surfaces. (B) Week 2: similar morphology on all surfaces. Some cells with larger diameter compared to week 1. (C–F) Day 17: polystyrene control, heparin, dermatan sulfate, and hyaluronan, respectively. Chitosan control and heparan sulfate surfaces exhibited cell morphology similar to the heparin surface.
