Abstract
Cell and developmental biology increasingly require live imaging of protein dynamics in cells, tissues or living organisms. Thanks to the discovery and development of a panel of fluorescent proteins over the last decades, live imaging has become a powerful and commonly used approach. However, multicolor live imaging remains challenging. The generation of long Stokes shift red fluorescent proteins offers interesting new perspectives to bypass this limitation. Here, we provide a detailed characterization of mBeRFP for in vivo live imaging and its applications in Drosophila. Briefly, we show that a single illumination source is sufficient to stimulate mBeRFP and GFP simultaneously. We demonstrate that mBeRFP can be easily combined with classical green and red fluorescent proteins without any crosstalk. We also show that the low photobleaching of mBeRFP is suitable for live imaging, and that this protein can be used for quantitative applications, such as FRAP or laser ablation. Finally, we believe that this fluorescent protein, with the set of new possibilities it offers, constitutes an important tool for cell, developmental and mechano-biologists in their current research.
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