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Stability of fulvestrant colloids in buffered solutions and serum-containing media. Fulvestrant (500 μM) colloids with the BODIPY FRET pair (10 μM) and UP80 were diluted (10-fold) into (A) PBS or (B) 90% FBS. Stability was measured over time by monitoring FRET fluorescence. Dashed line indicates baseline fluorescence of dye-only controls (n = 3, mean ± SD).
