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. 2016 Feb 24;6:21701. doi: 10.1038/srep21701

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Tracking of CaCO₃ Janus particles in tumor acidic microenvironments created in situ by HeLa cells incubated in non-buffered medium. For the sake of clarity, green fluorescent polymer microspheres used as reference particles are highlighted in green and H2B-mCherry HeLa cell nuclei are highlighted in red. Real time (min) in which the optical image was taken.