It has since been demonstrated in living mammalian cells that the uptake of 2-NBDG takes place through glucose transporters (GLUTs) in a concentration-, time- and temperature-dependent manner. A short-period application of 2-NBDG produced a remarkable increase in the fluorescence intensity in COS-1 cells over-expressing GLUT2, whereas the increase was barely detectable in mock-transfected cells. In mouse insulin-secreting clonal MIN6 cells, uptake was inhibited by cytochalasin B, a specific blocker for GLUTs, and by D-glucose in a dose-dependent manner.