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Generally, fluorescence imaging needs to be done in a dark environment using molecules with spectrally separated emissions. Here, Quérard et al. develop a protocol for high-speed imaging and remote sensing of spectrally overlapping reversible photoswitchable fluorophores in ambient light.
A genetically encoded tension sensor module for measuring molecular forces at 3–5 pN along with tools for multiplexed tension sensing and data analysis reveal an intramolecular tension gradient across talin-1 during cell adhesion.
Red-shifted luciferins and corresponding mutants of NanoLuc enable brighter bioluminescence imaging in vitro, in cells, and in deep tissues of living mice alone and in the context of the newly developed Antares2 BRET reporter.
Single fluorescent protein biosensors are susceptible to expression and instrumental artifacts. Here Ast et al. describe a dual fluorescent protein design whereby a reference fluorescent protein is nested within a reporter fluorescent protein to control for such artifacts while preserving sensitivity and dynamic range.
Gibberellins (GAs) control key growth and developmental processes in plants. Real-time monitoring of GA concentrations in living tissues is critical for understanding the actions of this hormone class. A first-generation optogenetic GA-nano-indicator now illuminates the effects of GA levels on cell length and light signalling.