And this means that if the DHAP is not changed in any way, is not transformed into this gap molecule, then what will happen is we will not be able to continue that glycosis process and therefore it will not be used to form those high energy ATP molecule that the cell needs so much to actually carry out processes. And so to prevent the loss of this potential energy that is stored in this three carbon molecule, the DHAP has to transform that molecule into the gap. And this is where that second enzyme comes into play. 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.