A sensitive and specific genetically encodable biosensor for potassium ions

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Potassium ions (K + ) play a critical role as an essential electrolyte in all biological systems. Here we report the crystal structure-guided optimization and directed evolution of an improved genetically encoded fluorescent K + biosensor, GINKO2. GINKO2 is highly sensitive and specific for K + and enables in vivo detection of K + dynamics in multiple species.

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