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Fluorescence image of cells cultured in collagen gels at day 1 and day 7 by the live/dead assay. Live cells marked with green-fluorescent calcein, and dead cells labeled with red-fluorescent ethidium homodimer-1. A, D 0.5 mg/ml collagen gels; B, E 1 mg/ml collagen gels; C, F 2 mg/ml collagen gels. A–C culture day 1; D–F culture day 7
