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Representative transaxial slices of [11C]-MET PET images. Images were taken at days 0, 7, and 14 after the start of a treatment regimen (control, 0.5 mg fulvestrant, 5 mg/kg/day letrozole, and 8 mg/kg/day tamoxifen). Black arrows indicate ER+ tumors; gray arrows, ERαKD tumors.
