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(A) Radiosynthesis of [18F]PTTP by Fu et al. (B) Small-animal PET/CT imaging of [18F]PTTP in mice: representative inflammation cohort (i), A549 tumour cohort (ii), and competitively blocked cohort (iii) at 5 min after injection (adopted from [62]; RCY: radiochemical yield; Am: molar activity).