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Effect of amount of TAT peptide bound to NP surface and the peptide sequence on uptake of ritonavir in HUVEC cells. Cells (3 × 104 cells) were incubated with either ritonavir in solution, or unconjugated and conjugated RNPs (drug concentration = 5 μM) for different time periods. Data are expressed as mean ± s.e.m (n = 3).
