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. Author manuscript; available in PMC: 2008 Aug 22.
Published in final edited form as: Bioconjug Chem. 2006;17(4):920–927. doi: 10.1021/bc060044i

Figure 6. Differential cytotoxicity of QDs, CPP, or QD-CPP assemblies.

Figure 6

The acute (short-term) and chronic (long-term) cytotoxicity of unconjugated QDs, free CPP, or QD-CPP assemblies (ratio QD:CPP = 1:25) was assessed using COS-1 and HEK 293T/17 cells. In the acute studies, COS-1 (panel A) and HEK 293T/17 (panel B) cells were incubated with the materials for one hour, washed, and subsequently cultured for 24 hours prior to viability assay. In the chronic studies, COS-1 (panel C) and HEK 293T/17 (panel D) cells were cultured for 24 hours in the presence of the materials prior to viability assay. Symbols correspond to: QD-CPP (■), unconjugated QDs (▲), and free CPP (○). For QD-CPP or unconjugated QDs, the concentrations designate those of the QDs. Each data point represents the mean ± SD of triplicate measurements.