Affiliation: | 1. Department of Nanobiophotonics, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 G?ttingen, Germany, Fax: (+49)?551‐201‐2505;2. German Cancer Research Center, High Resolution Optical Microscopy Division, Bioquant‐Zentrum, Im Neuenheimer Feld 267, 69120 Heidelberg, Germany |