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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
MR images before and after intratumor injection of Au and Au-UCNPs-DSPE-PEG2K in Balb/c mice, (a,b) are before and after injection of Au, (c,d) are before and after injection of Au-UCNPs-DSPE-PEG2K.