But in the structure and complex three, we also have another cytochrome molecule known as cytochrome B. And this molecule actually contains two different heme groups that are capable of actually attaching electrons. And finally, we also have a structure known as the risky group. And this contains the two fe two sulfur group that can also bind electrons and transfer electrons onto different groups. So the entire process by which electrons are transferred from the Ubiquinol onto the cytochrome C molecule is known as the Q cycle. And the Q cycle is actually composed of two major mini cycles.