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Phase contrast microscopic images of chondrocytes plated on the 1:0.5PEG(3400) hydrogel sheet showing: (a) confluent chondrocytes (b) partially detached chondrocytes as a cell sheet after exposure to room temperature (an arrow indicates the site of detachment) (c) completely detached chondrocytes as a cell sheet (scale bar = 50, 50, and 100 µm, respectively).
