Cytotoxicity of materials used for cargo delivery by PR9 as determined using the MTT assay.

<p>Cells were treated with QD, PR9, chloroquine, PR9/QD, QD/chloroquine, PR9/QD/chloroquine, QInP alone and PR9/QInP complexes for 24 h. Significant differences at <i>P</i><0.05 (*) and <i>P</i><0.01 (**) are indicated. Data are presented as mean ± SD from three independent experiments.