Catalytic: 2TAA (A), 1ZNB (A), 1PFK (A), 1EW2 (A)
Allosteric: 1A3W (A,B), 1SGI (A,B), 9GPB (A,B), 4CSM (A,B)
Interface: 1BRS (A,D), 2PTC (E,I), 1VFB (A,B,C), 3HFM (H,L,Y)
Contact-network criterion: minimum heavy-atom inter-residue distance <= 5.0 Å.
