Now remember from organic chemistry that radicals are very reactive. And what happens in this particular case is the vitamin B twelve is used by this mutase enzyme to help abstract an h atom from this methyl group. So we essentially take away this h atom, we take away the one electron with that h atom and we basically help form a sigma bond, a single bond between the H and the carbon as shown in this particular diagram. And we also generate a radical species on this carbon. And so we form this unstable reactive intermediate. Now in the next step, we basically want to take this entire group shown in blue and move it onto this carbon.