Because just because we're at rest, that doesn't mean our cells aren't actually carrying out these processes. So we find these glute one molecules essentially in all the cells of our body. But these glute one membrane proteins predominate in the membranes of red blood cells, while the glute three predominate in the membranes of neurons found in the brain. So we find them on dendrites as well as on exons of neurons found in the brain. Now, both of these glucose transporters, glute one and glute three, basically have a relatively low Km value. Now, before we talk about that, let's define what the concentration of glucose is normally in our blood.