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Micro-CT 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 high concentration (50 mg/mL) of Au, (c,d) are before and after injection of low concentration (180 µg/mL) of Au, (e,f) are before and after injection of 180 µg/mL of Au-UCNPs-DSPE-PEG2K.
