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Stereo figures of the electron density of the active site of bovine TAFI with the bound malonate as a stick model and the catalytic zinc as a yellow sphere. Shown is the final 2Fo - Fc map, contoured at 1σ. Top, active site of molecule I. The electron density for molecule II is equally well defined. Bottom, active site of molecule III. This molecule has extremely high temperature factors, and in particular, many side chains are much less well defined as in molecules I and II.
