And when it gains that electron, it is basically partially reduced into a molecule we call the semiquinone radical ion, which contains a negative charge. And we'll see why we formed that in just a moment. So let's summarize the first half cycle of the Q cycle. So this Q cycle begins when the Ubiquinol QH two attaches onto complex three, as shown here. And upon binding, the two electrons follow two different pathways, and the two protons are pumped into the intermembrane space of the mitochondria. Now, one of these electrons moves onto the risky center, the two fe two sulfur group of the risky center, and then it is transferred onto the heme group of Cytochrome C one, reducing the three plus form into the two plus form.