Fura-2, AM is a high-affinity intracellular calcium indicator that Measured by the ratio method, which can be excited by ultraviolet light. The acetyl methoxy (AM) ester is available for non-invasive intracellular dosing and is also available in 1 mg packages (F-1201) and DMSO solution (F-1225). The dye is available as non-cell-permeable pentapotassium (F-1200) and pentasodium (F-6799) salts.