Confocal microscopy images of J774A.1 cells treated with core-shell microgel MS1.

<p>(a) Naphthalimide green fluorescence of core-shell microgels inside cells. (b) Porphyrin red fluorescence of core-shell microgels inside cells. (c) Overlay images of (a) and (b). Green fluorescence was excited at 440 nm and emissions were collected using a 515/30 nm filter set; Red fluorescence was excited at 440 nm and its red emission was collected using a 605/75 nm filter set. Scale bars represent 20 µm.