The second enzyme that catalyzes the conversion of the DHAP into the gap, it's known as trios phosphate isomerase, or simply TPI. Sometimes we also call it T imtim. So an enzyme called trio sposphetosomerase TPI catalyzes the rapid and the reversible conversion of the DHAP to the gap. So rapid simply means it takes place very quickly. And reversible means once we go this way, the enzyme also catalyzes that reverse reaction. In fact, once equilibrium is actually formed, this exists as the predominant molecule.