We have six regulatory chains to make a total of twelve of these subunits that make up the coronary structure of aspartame transcarbolase. And if we examine the three dimensional structure of this molecule from top to bottom, this is basically what we see. So these red dimers are the regulatory dimers. So each one of these dimers consists of 121212 of these regulatory chains. And this entire orange structure constitutes a single catalytic primer. So we have one, two, three of these orange subunits.