Live-cell multiphoton fluorescence correlation spectroscopy with an improved large Stokes shift fluorescent protein

An improved variant of mKeima, a monomeric long Stokes shift red fluorescent protein, is introduced, called hmKeima8.5. Its increased intracellular brightness and long Stokes shift (~180 nm) make it an excellent partner with teal fluorescent protein (mTFP1) for multiphoton, multicolor applications. Here we demonstrate its utility in intracellular fluorescence correlation spectroscopy applications.

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