Fig. 1: Schema of the soluble profluorophore QPD-OTf and the insoluble fluorescent dye QPD and QPD crystal in cells.
From: Kinesin-1 activity recorded in living cells with a precipitating dye

a Structure of QPD-OTf and QPD. b Aster-like QPD crystal in live U2OS cell (20 µM QPD-OTf, 4 h); green: crystal. Left: QPD fluorescence; middle: bright field image; right: merged channels. Scale bar 20 µm. c FIB-SEM 3D-reconstruction of the crystal inside HeLa cells; green: crystal. Scale bar 0.4 µM.