So let's move on to step number or process two of the pentose phosphate pathway, specifically the non oxidative phase of this pathway. So we take one of these cellulose phyphosphate molecules and we take another ribose phyphosphate molecule. So so far we actually used three ribose phyphosphate. So two were used here. And now the third one we're using in this particular step. So we have the enzyme transketilase, which actually requires a cofactor we call Thiamine pyrophosphate.