Figure 1. Viability of U-87 MG (A, C) and HeLa (B, G) cells incubated with free Dox, embedded in phospholipid NPs (NPh-Dox), Dox embedded in phospholipid NPs with a targeted peptide (NPh-Dox-cRGD ) for 24 h (A, B) and 48 h (V, G) in different concentrations. Data are presented as mean ± standard deviation (n = 4).