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Hexamer formed by peptide 2 that can be interpreted either as a trimer of dimers or as a dimer of trimers. (A) X-ray crystallographic structure of the hexamer formed by peptide 2. (B) Interpretation of the hexamer as a trimer of dimers. One dimer subunit is colored green. (C) Interpretation of the hexamer as a dimer of trimers. One trimer subunit is colored cyan.
