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MTT assay for cellular toxicity of 293T cells. Cells were incubated with polyamidoamine, fluorescence-labeled acetylated polyamidoamine, acetylated polyamidoamine and fluorescence-labeled acetylated polyamidoamine lung cancer targeting peptide, at varied concentrations. The viability of the nontreated cells was arbitrarily defined as 100%. Data are expressed as mean ± standard deviation (n = 6).
