But when the binding actually takes place, the enzyme actually conforms to the structure of that substrate. And so the enzyme's active side basically changes shape ever so slightly. It induces the shape. And then once the binding takes place, the active side basically conforms and takes the complementary shape of that particular substrate molecule. So in the induced fit model, the shape of the enzymes active side is not exactly complementary. However, upon binding of the substrate to the active side, the binding causes the active side to become complementary to that substrate.