And we'll see why that H plus ion is needed in just a moment. And so, in the process, we ultimately oxidize the NADH back into NAD plus. And those two electrons are extracted by a group known as FMM, and the FMN stands for Flavin mononucleotide. So within this vertical component of complex one, we have Flavin mononucleotide, which accepts those two high energy electrons from the NADH molecule. Now, if we take a look at the structure of FMM, this is what it's going to look like in its fully oxidized form. So oxidized basically means before it accepted those electrons.