And this is the same thing as saying step eight, nine and ten of the overall glycolytic pathway. So before we discuss step three, let's remember what happened in steps one and two of stage three of glycolysis. So in those two steps, two molecules of glyceroaldehyde, three phosphate are transformed into two molecules of three phosphoglycerate. And so the beginning point of step three is this three phosphaglycerate molecule. And so that's what we have shown on the board. Now, this is carbon one, carbon two and carbon three.