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The 18F-FHBG cell uptake assay for the cTK variants. (A) The 18F-FHBG uptake of three cTK variants (cTK76, cTK266, and cTK276) transiently transfected UM-SCC-22B cells, with untransfected cells as the control (mock). The cells were stimulated with Dox (1 μg/mL) for 24 h to induce apoptosis. (B) Fold change of FHBG uptake in treated cells compared with untreated cells. Results were representative data collected from independent duplicate experiments.
