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Effect of an R9 tag on the uptake of a protein by living mammalian cells. CHO-K1 cells were incubated with fluorescein-labeled RNase A-R9 (10 μM, A) or fluorescein-labeled RNase A (10 μM, B) for 15 min at 37°C before visualization by fluorescence microscopy. Scale bar: 10 μm.
