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Toxicity study of the EGF-Au NP-Pc 4 conjugates in the dark and under light exposure. (A) PDT effect of the EGF-Au NP-Pc 4 conjugates after 4 hours incubation measured with an MTT assay. (B) Bright field images of the conjugate-incubated cancer cells before and (C) after light exposure. Dead cells are colored blue due to the staining by trypan blue.
