Now, normally, the protoporphine ring has a planar shape, so the shape of it is relatively planar. But to actually fit that fe atom, the metal atom, into the center of that protoporphine, what this enzyme does, what the ferrocalitase does is it basically bends the shape of that protoporphine ring and then that exposes the electrons, the lone pair of electrons that can now bind that fe atom. And so what the ferrocalitase does is it basically catalyzes the bending of that planar shape of the protoporphrine molecule. And that allows the fitting, that allows the insertion of that fe atom into that hin group, into that protoporphrine. Now, how can we use this to basically build an antibody with a specific type of catalytic ability? Well, normally, the protoporphrine has a planar shape and we see that what this enzyme does is it basically bends the shape.