Fig. 4. In vitro cytotoxicity of PTX-SA LPs. Viability of cells incubated with a series of concentrations of PTX, PTX-SA and PTX-SA LPs against 4T1 cells for 48 h (A) and 72 h (B) and against RM-1 cells for 48 h (C) and 72 h (D). Data are presented as mean ± SD (n = 3).