In addition, you also have to be aware of the cysteine residue that is also present in this FAS molecule because it will also play an important role as we'll see in just a moment. So step number one is catalyzed by one of the catalytic domains we call acetil transasilise and that is found on this FAS molecule. And so what this enzyme does or what this catalytic domain does is it catalyzed the attachment of this acetyl coenzyme A molecule onto this sulf hydro group and we generate this intermediate shown here. In addition, we kick off the coenzyme A as shown here. Now, this acetyl coenzyme A is not the same as this acetyl Co enzyme A. So like I said, we're basically putting this malnozyme A away for just a moment because we're going to use it in one of these later steps.