Now, what exactly happens under normal physiological conditions inside our body and inside our cells? Well, typical physiological conditions basically involve a relatively low concentration of substrate. So under typical physiological conditions inside our cells, the substrate concentration is usually very low and the substrate concentration is usually between zero and the Km value. And so what that means is the concentration of that substrate under normal conditions is usually much smaller than the Km value. So if we are to pinpoint where the concentration of that substrate in our cells usually is, it's somewhere around, let's say, this quantity here. So it ranges between this X value range here.