And not only that, the other group attached to this center alpha carbon is an amino group that has been protonated. Now we'll see why this is protonated and why this is deprotonated in just a moment. So we have this other amino group, as shown in the diagram. So let's draw it in the protonated form with the positive charge. And we have one of the other groups is an H atom, as shown here. So that's the alpha H atom.