Now, Ubiquinone accepts two electrons and it also actually accepts two H plus ions. So it takes up two H plus ions from the matrix and it forms the fully reduced form of Ubiquinone, QH two, which is known as Ubiquinol. So once again, the electrons, once they abstract and biflavin mononucleotide then move along a series of iron sulfur groups shown here and are ultimately transferred to coenzyme Q Ubiquinone. The Ubiquinone also uptakes two protons and that helps us establish that electrochemical gradient. And those two H ions bind onto Q to basically form the reduced form of Ubiquinone known as Ubiquinol. And as these electrons move along this proton complex it pumps four H plus ions from the matrix side onto the intermemmbrane side.