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Active site of CcO with the CO bound to the heme Fe (Left) and to CuB (Right) before and after photodissociation, respectively. The orange, magenta, and gray and red spheres represent the van der Waals radii for the heme-a3 Fe atom, CuB, and CO, respectively. The two images correspond to two snapshots of a trajectory calculated by using molecular-dynamics simulations.
