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Far-red fluorescent proteins are required for deep-tissue and whole-animal imaging and multicolor labeling in the red wavelength range, as well as probes excitable with standard red lasers in flow cytometry and fluorescence microscopy. Rapidly evolving superresolution microscopy based on the stimulated emission depletion approach also demands genetically encoded monomeric probes to tag intracellular...
We determined the 2.2 Å crystal structures of the red fluorescent protein TagRFP and its derivative, the blue fluorescent protein mTagBFP. The crystallographic analysis is consistent with a model in which TagRFP has the trans coplanar anionic chromophore with the conjugated π-electron system, similar to that of DsRed-like chromophores. Refined conformation of mTagBFP suggests the presence of an N-acylimine...
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