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(a, b) Light micrographs of trypan blue dye test for epithelial cells vitality. In both TUE (a) and TTE (b) positive, dead cells (arrow) can be observed. Scale bar: 80 μm. (c, d) Light micrographs of TUNEL reaction of corneal epithelium. In both TUE (c) and TTE (d) no positive cells can be observed. Scale bar: 30 μm.
