Abstract

In the last few years the visualization and tracking of single fluorescent proteins, nanometer-sized RNP particles and viruses within the cellular interior was accomplished. This became feasible by use of photostable fluorescent dyes, extremely low probe concentrations, and wide-field fluorescence microscopic setups equipped with sensitive slow-scan or intensified CCD cameras. This paper reviews the results of the studies performed so far, discusses potential problems and gives an outlook on future applications.

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