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Proposed packing of GNNQQNY β-strands (represented by arrows) in the unit cell of the microcrystals. The strands are extended and form parallel β-sheets. Each sheet packs against one neighboring sheet with its strands parallel to the first and one sheet with its strands antiparallel to the first. The registration of the sheets with one another along a and c is not yet known. The spacing between strands and sheets is ≈4.8 Å and ≈10 Å, respectively.
