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Characterization of PHEA-C18-MA polymersomes modified with the NIR probe, FPR-675. (a) UV–visible spectrum of MA-2.7 conjugated with FPR-675. (b) The NIR fluorescence image of (I) free FPR-675 solution, (II) FPR-675-labeled MA-2.7 polymersome suspension, and (III) FPR-675-labeled MA-4.8 polymersome suspension. The methacrylate groups in the bilayers of polymersomes were cross-linked.
