Example of a supersite within the ferredoxin-like folds. There is a general tendency for proteins adopting this fold to bind ligands on a flat, exposed beta sheet as shown in the figure.

Non-protein atoms are coloured according to the superfamily to which they belong. Proteins adopting the same fold (e.g. ferredoxin-like) but from different superfamilies may be the result of convergence to a stable folding motif rather than divergence from a common ancestor.