As of late 2007, 26 structures have been solved for this class of enzymes, with PDB accession codes , , , , , , , , , , , , 2JB4, 1QJE, 1ODN, 1HB1, 1HB2, 1HB3, 1HB4, 1QIQ, 1QJF, 1BK0, 1BLZ, 1OBN, 1OC1, 1IPS
