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Electrostatic surface representation of the HsCutA1 trimer. Red represents negative charge and blue positive. (a) Side view of the protein, showing the putative active-site cleft. (b) The view from one side of the threefold axis of symmetry vertical to the plane of the paper. (c) The view rotated 180° around the threefold axis from the orientation shown in (b). In the hexamer the trimer interacts using this face.
