IPG-1 TMA is a cell-impermeable fluorescent potassium indicator. It binds to potassium (Kd = 50 mM) and displays excitation/emission maxima of 525/545 nm, respectively, and can be used in lipid membrane-free systems or liposomes or can be introduced into cells by electroporation, microinjection, or other methods. IPG-1 TMA is also available in a cell-permeable form .
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