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Fig. 7. Three-dimensional model of mouse cathepsin E. The modelled structure of mouse cathepsin E was based on the known structure of human cathepsin E. His residues are indicated in light blue, other positively charged residues are indicated in dark blue and negatively charged residues are indicated in red. A potential heparin-binding site on the N-terminal domain is outlined by a green border, with contributing side chains labelled. Four different views of the molecule, 90° apart, are shown. (A) Front view. (B) Top view looking down into the active-site cleft. (C) Back view. (D) View from the bottom of the molecule, opposite to the active-site cleft.