Tissue samples were divided into the following groups (n = 8 each): group A:ICG 0.1%, exposure 1 minute, light exposure 3 minutes; group B:ICG 1%, exposure 1 minute, light exposure 3 minutes; group C:BSS, exposure 1 minute, light exposure 3 minutes (control); group D:ICG 0.1%, exposure 30 minutes, light exposure 3 minutes; group E:ICG 1%, exposure 30 minutes, light exposure 3 minutes; group F:BSS, exposure 30 minutes, light exposure 3 minutes (control); group G:ICG 0.1%, exposure 1 minute, no light exposure; group H:ICG 1%, exposure 1 minute, no light exposure; group I:BSS, exposure 1 minute, no light exposure (control).