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(A) Ex vivo biodistribution (2 h after injection) with single 18F-CDKi injection or with preinjection of palbociclib (blocked). (B) Significance of tumor %ID/g between 18F-CDKi and blocked control group. (C) Tumor-to-nontarget (NT) ratio for blood, muscle, and bone (n = 4). Int = intestine.
