Figure 3From: Cytotoxicity and cellular uptake of tri-block copolymer nanoparticles with different size and surface characteristics Cytotoxicity of PNP 90 -NH 2 (▲), PNP 90 -OH (■) and PNP 90 -COOH (●) on NR8383 and Caco-2 cells as measured by the MTT assay after 24 h exposure. The * sign signifies p < 0.05 compared to negative control (0 μg/ml).Back to article page