Mag-Fluo-4 potassium salt - 10x50 ug

The cell-impermeant Mag-Fluo-4 is an analog of Fluo-4 with a Kd for Mg ion of 4.7 mM and a Kd for Ca ion of 22 µM, making it useful as an intracellular Mg ion indicator as well as a low-affinity Ca ion indicator.