BIOMOLECULE THIS ENTRY CONTAINS THE CRYSTALLOGRAPHIC ASYMMETRIC UNIT WHICH CONSISTS OF 2 CHAINS. ...BIOMOLECULE THIS ENTRY CONTAINS THE CRYSTALLOGRAPHIC ASYMMETRIC UNIT WHICH CONSISTS OF 2 CHAINS. The biological unit is a hexamer. One hexamer is formed as follows: Molecule A forms a trimer with the symmetry operators 1/2-z,-x,1/2+y and -y,1/2+z,1/2-x. A second trimer is formed from the symmetry operators -x,1/2+y, 1/2-z; z,x,y; and 1/2-y,-z,1/2+x based on the coordinates of molecule B but does not actually include molecule B. The two distinct trimers form a hexamer. A second hexamer is formed as follows: Molecule B forms a trimer with the symmetry operators -z,1/2+x,1/2-y and 1/2+y,1/2-z,-x. A second trimer is formed from the symmetry operators -x,1/2+y,1/2-z; 1/2+z,1/2-x,-y; and y,z,x based on the coordinates of molecule A but does not actually include molecule A. The two distinct trimers form a second hexamer.