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A cell-impermeable fluorescent potassium indicator
IPG-4 TMA is a cell-impermeable fluorescent potassium indicator that has been used to detect extracellular potassium in B. subtilis biofilms.1 It binds to potassium (Kd = 7 mM) and displays excitation/emission maxima of 525/545 nm, respectively. IPG-4 TMA is also available in a cell-permeable form .
1.Prindle, A., Liu, J., Asally, M., et al.Ion channels enable electrical communication in bacterial communitiesNature527(7576)59-63(2015)
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