And by cleaving that Sigma bond, we're essentially shortening that fatty acid chain by two carbon. So each cycle removes two carbon component molecules. So we begin with an activated fatty acid. And activated simply means we've done something to the fatty acid. We attached a specific group onto that fatty acid to make it more reactive. And in this particular case, the group we attached is the Rprine group, and this is usually the coenzyme molecule, and that makes it more active.