Now, the reduced dismutase then reacts with another superoxide anion as well as with two H plus ions. And this allows us to basically oxidize this, reduce this mutate back into the oxidized version. So we regenerate that enzyme and we also form this hydrogen peroxide. Now, hydrogen peroxide in itself is also a very reactive molecule and it can be very dangerous and that's exactly where the second enzyme comes into play. Our cells also contain an enzyme known as catalase. And catalase is actually a protein that contains a heme group.