Fura-2 leakage resistant AM is a cell-permeable, ratiometric fluorescent calcium indicator. It binds to calcium (Kd = 145 nm) and displays excitation maxima of 340 and 380 nm when calcium-bound or calcium-free, respectively, when the emission is fixed at 505 nm. Fura-2 leakage resistant is also available in a cell-impermeable form .
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