Fig. 3. The fluorescence response of the ONOO-CBP labeled RAW264.7 cells after incubation with 100 μM SIN-1 for 60 minutes. After biotin uncaging, the cells were stained with (i) streptavidin–Alexa488, (ii) streptavidin–Cy3, and (iii) streptavidin–Cy5. Scale bar: 20 μm.