And that's exactly why the second electron cannot follow this same pathway. It has to follow a different pathway. And by following this different pathway, what we ultimately accomplish by the second electron pathway is we're able to actually recycle that electron and use that electron in a future process, as we'll see in more detail in just a moment. So once this electron binds onto the oxidized Cytochrome C, it reduces that Cytochrome C the cytochrome C then detaches and diffuses within the fluid of the intermembrane space and travels and binds onto complex four. While the other electron, because it cannot go via this same pathway, it follows a different pathway. And that's where Cytochrome B comes into play.