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Cytotoxicity of the conjugates in the dark and cytotoxicity of the light alone. The viability of U87-MG cells (A) incubated with SiPc-COOH 3, RGD-SiPc 4, RGD-Linker-SiPc 5, RGD-(Linker)2-SiPc 6 and RGD-(Linker)2-Glu-SiPc 7 without light and the viability of U87-MG, 22RV1, PC3 and A431 cells with light illumination alone (36 J/cm2) (B) were determined by MTT assay.
