Fig. 3From: Gelatin–chlorin e6 conjugate for in vivo photodynamic therapyIn vitro phototoxicity of gelatin–Ce6 after laser irradiation. MTT assay a in the dark and b after laser irradiation in SCC-7 cells treated with free Ce6, gelatin–Ce6-2, or gelatin–Ce6-8 for 2 h. (n = 5)Back to article page