qMaLioffG: A single green fluorescent protein FLIM indicator enabling quantitative imaging of endogenous ATP
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The widespread use of fluorescence lifetime imaging microscopy (FLIM) for quantitative imaging is hindered by the limited availability of a FLIM-based genetically encoded indicator using a conventional 488 nm laser. Here, we present qMaLioffG, a single green fluorescent protein FLIM indicator showing a fluorescence lifetime change in ATP concentration within the physiological range. This allows quantitative imaging of endogenous ATP to investigate cellular energy status of different cell types.
