Abstract
Near-infrared (NIR)-to-visible upconversion nanomaterials (UCNPs) used as biomedical nanoprobes have considerable advantages over the traditional used "downconversion" fluorescent dyes. Functionalized upconversion nanoparticles (UCNPs) represent high sensitivity and great biocompatibility. Cells labeled with these UCNPs can be tracked for long term in vivo. Here we describe UCNP-PEG-ARG for highly sensitive in vivo cell tracking.
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