Fig. 8. Close-up stereoview comparing the interactions of the C-terminal tails of haemadin (red) and hirudin (green) with the fibrinogen-recognition exosite of a neighbouring thrombin molecule (blue) (see text for details). Side chains of interacting thrombin/inhibitor residues are labelled explicitly. Notice the close agreement between the phenyl moieties of Phe47I and Phe56H; also the side chain pairs Phe50I–Ile59H and Glu48I–Glu57H occupy similar positions.