Fig. 1.

Conversion of EGFP-PDI fluorescence signals into DAB-precipitates. The figure shows fluorescence microscopic images of the same field of cultured Hela cells prior to (a) and after illumination (b), and corresponding to b, the respective phase contrast image (c). After illumination, the brightly stained cells visible in a are bleached, and hence, no longer visible in the fluorescence microscope (b). In parallel, DAB-depositions became apparent (c) indicating the successful conversion process