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Cancer targeting photoacoustic probe: (a) Illustration of the activation mechanism of Rhodol-PA for PA/NIRF imaging; (b) Representative photoacoustic (top) and fluorescence (bottom) images of HT-29 and MDA-MB-231 tumor-bearing living mice at different time points upon intratumoral injection of Rhodol-PA. Adapted with permission from [130]—Published by The Royal Society of Chemistry. Scale bars = 2 mm.
