HeLa cells incubated with fluorescent organic nanoparticles for 24 hrs. Will Primrose, PhD student in Dr. Zac Hudson lab, Dept of Chemistry, collected images using an Olympus FV1000 Laser Scanning Two-photon Confocal microscope. Left image: bright field image showing HeLa cells, middle image: multi-photon image captured with a Spectra physics Mai Tai DeepSee pulsed laser at 905 nm excitation showing fluorescent nanoparticles, right image: merged image of bright field and fluorescence images.