And so six divided by four gives us 1.5 ATP molecules are generated when the six H plus ions move when a single NADH is oxidized by the electron transport chain. Now, what about the other shuttle? So cells such as cardiac muscle cells, so the heart cells and liver cells utilize a slightly different shuttle known as malate aspartate shuttle. And the thing about this shuttle is the high energy electrons produced by or found on the NADH produced in the glycolytic pathway ultimately end up being transported onto complex one. And complex one essentially pumps a net amount of four H plus ions into the intermembrane space. And so here we have four plus two plus four.