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Polymeric Janus particles with dyes partitioned to separate hemispheres. The images are overlays of confocal laser scanning microscopy images obtained at 568 and 488 nm. (a) Janus particles loaded with two hydrophobic dyes, Nile red (red) and Rh-6G (green). (b) Janus particles loaded with Nile red and the hydrophilic dye FITC-dextran (green).
