Figure 2.

Two approximately perpendicular views of the molecular structure of ImCbl in a stick representation. The central Co atom is depicted as a pink sphere. N, O, and P atoms are drawn in blue, red, and orange, respectively. C atoms are drawn in gray in the B₁₂ trunk and in light blue in the β-ligand (imidazole conformation with higher occupancy). H atoms have been omitted for clarity. The figure was prepared using the program PyMol (http://www.pymol.org/).