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Applications of confocal and fluorescence microscopy.

Fluorescence microscopy has become a powerful tool for both the localization of cellular components in fixed cells, using target-specific fluorescent probes and labeled antibodies, and the fluorescence imaging of ions in single living cells. Despite its markedly lower spatial resolution when compared with electron microscopy, the essentially non-invasive nature of light microscopy provides a unique tool for examining cell behaviour at the level of the single cell bringing new insight into both cellular heterogeneities and cell-cell interactions. Further developments in both fluorescent probes and instrumentation should provide even more powerful tools to probe the mechanisms of cell function, both in vitro and in vivo.