And notice that before the binding actually takes place, this is complementary in structure to this active side. And so when they fit, this simply moves into the active side and then they form those non covalent interactions. Now, according to our induced fit model, the active side of that enzyme is not exactly complementary to our substrate. 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.