Now, we can further subdivide sequential reactions into two types. We have ordered sequential reactions, and we have random sequential reactions. And let's begin by focusing on the ordered sequential reaction. So in this ordered sequential reaction, the order at which the two substrate molecules the two reactants bind onto the active side, as well as the order at which the two products are released by the active side, actually matters. And one common example that describes an order sequential reaction is a reaction that takes place in the process of glycolysis. So remember, in Glycolysis, the ultimate goal is to basically produce pyruvate molecules and NADH molecules.