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View of the crystal packing of TeAPC, showing two sheets of trimers. In the back sheet α subunits are magenta and β subunits are cyan; in the front sheet α subunits are red and β subunits are blue. (a) View down the trimer axis; (b) view perpendicular to the trimer axis. In the physiological hexamer, the α subunits are on the inside and the β subunits are on the outside.
