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Vitality of cells in constructs after 14 days of culture. Fluorescent microscopy images of PI/FDA stained constructs showing living cells in green and dead cells in red: (A,C) cells in bioprinted gelatin; (B,D) cells in bioprinted hyaluronic acid; (A,B) low density = 5 mio cells/mL; (C,D) high density = 25 mio cells/mL. Scale bar = 250 μm.
