Light-switchable protein translocation. a) Schematic of the light-induced reversible binding of cytoplasmic LDB-3-mCherry to membrane-bound DrBphP-AcGFP. b) Fluorescence images of a HEK293T cell coexpressing LDB-3-mCherry (red) and DrBphP-AcGFP (green) for 24 h and then subjected to three illumination steps: i) 775 nm (0.2 mW/cm2, 10 min; left), ii) 654 nm (0.2 mW/cm2, 2 min; middle), and iii) 775 nm (0.2 mW/cm2, 10 min; right). Bars, 10 μm. c) Intensity profile of mCherry fluorescence intensities along white dashed lines in b). 5 μM biliverdin was supplemented in the medium.