Fig. 4. Cell apoptotic analysis by Annexin V-FITC / PI double fluorescent.(a), (e) blank group; (b), (c), (d) 15, 30, 60pg/mL of R-PE treated group; (f), (g), (h)PDT treated with 15, 30, 60pg/mL R-PE group. Irradiation dose of PDT was 12.5J/cm2