So the oxidative phase begins with the dehydrogenation of the glucose six phosphate at the first carbon. So dehydrogenation simply means we're removing H ions. So an enzyme called glucose six phosphate dehydrogenase catalyzes the transfer of a Hydride ion. So that's an H plus ion and two electrons from the glucose and onto the NAD plus carrier molecule. So this is the electron acceptor that picks up two electrons and that H plus ion. And we also release a hydrogen ion.