Figure 3. Representative images for TUNEL assay and cytokeratin 10 immunolabeling. Only a few apoptotic cells were observed in the superficial layer of corneal epithelium in control group (A), while much more apoptosis were recorded in corneal basal epithelium after BAC treatment (B). K10 was positive in corneal epithelium after BAC treatment (D) and negative in the control (C).