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Pore-facing regions of inter-subunit contact. (a) Bottom view of the pentamer along the five-fold axis of symmetry, showing the tandem arrangement of the β1–β2 loops and the ring of ten aspartate and five asparagine residues. (b) Inter-subunit contacts between the tip of the β1–β2 loop of the principal subunit (blue) and the stem of the β1–β2 loop of the complementary subunit (orange).
