In the "list cofactors" list you can have a list of the EC numbers
containing each cofactor.
It would be nice to have that converted into a search so you ca also see
the names of the enzymes in question. As it is now, a new window is opened
if you click on one of the EC numbers. That can end up being quite a number
of windows if you want to see the names of all the enzymes with zinc (153