Figure 6. Thermal probability ellipsoids for the active
sites of the (a) Cu-Zn, (b) as-isolated and (c) Zn-Zn
structures. The sites show only limited anisotropy. The highly
anisotropic ellipsoid for Cu(II) in the Cu-Zn structure is
indicative of a range of positions adopted by the metal ion.
The above figure is reprinted
by permission from Elsevier:
J Mol Biol