Fig. 2

Construction and characterization of DOX and PD-L1 siRNA encapsulated nanoparticles (NPDOX/siPD-L1). a The diagram of the construction of NPDOX/siPD-L1. b The weight ratios of DOTAP to siPD-L1 were determined using gel retardation. Besides, c, d TEM image, size distribution, and surface potential of NPDOX/siPD-L1 were also determined. All the experiments were repeated three times with similar results