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(A) In vivo images of mice bearing HT29 tumor showing the composite fluorescence before and after intra-tumor injection of FAP-PPB (25 nmol) on the left flank. (1) Prescan, (2) 5 min post injection, (3) 1h post injection, (4) 8h post injection, and (5) 24h post injection. (B) Microscopic images showing the localization of FAP-PPB in HT29 tumor frozen section. (1) Differential interference contrast image, (2) Pyro’s fluorescence image, and (3) Superimposed image.
