Effect of tea leaf extract on Caspase 3 expression in gill epithelium. A shows negative Caspase 3 expression in epithelium of control fish. B shows severe Caspase 3 expression in the gill epithelium (arrowhead) of fish exposed to CMN. C shows effect of moderate Caspase 3 expression in the gill epithelium (arrowhead) of TLE (50mg) pretreated fish after exposure to CMN. D shows mild Caspase 3 expression in the gill epithelium (arrowhead) of TLE (100mg) pretreated fish after exposure to CMN, H and E, Bar: 50 µm.