Asante Calcium Red-2 (ACR-2) known Commercially as ICR (Ionbiosciences Calcium Red)

One of the great achievements of the late Roger Tsien, a 2008 Nobel Prize winner in chemistry, was the invention or creation of a compound that allows scientists to study calcium in the cell, in the cytosol, non-invasively through fluorescence. These compounds, which I call "modern fluorescence calcium indicators" are now used in research and in drug screening, and mostly use UV or green fluorescence. There has been an effort to make red-emitting calcium indicators since the first one was r...