Fig. 9
From: Polyethylenimine-CO2 adduct templated CaCO3 nanoparticles as anticancer drug carrier
Particles were incubated with HeLa cells, and the encapsulated DOX was released into the cells. The particles with PEI-CO2 released DOX more rapidly (right group) than did the particles with PEI (middle group). Red: DOX; Blue: nuclei. Scale bars: 25 μm