A Nanogel with Effective Blood-Brain Barrier Penetration Ability through Passive and Active Dual-Targeting Function

Figure 3

The size and size distribution of DPPC (a); TEM image of DPPC/DOX (b); the cytotoxicity of PEI, PPP, and DPPC (c); the surface potential of different groups (d).

(a)

(b)

(c)

(d)