Fig. 1From: Polyethylenimine-Based Amphiphilic Core–Shell Nanoparticles: Study of Gene Delivery and Intracellular TraffickingSEM micrograph of PMMA–PEI core–shell nanoparticles. Inset TEM micrograph of nanoparticles showing well-defined PMMA cores (lighter part) and PEI shells (darker region)Back to article page