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Stereoviews of the apo Δ(1–43)A-I Cα trace. (a) The apo Δ(1–43)A-I monomer, molecule A. The N- and C-termini are labeled, as are each of the secondary structural elements described in the text. These elements are also colored differently. (b and c) The apo Δ(1–43)A-I A/B dimer, and the tetramer. The molecules are colored as in a to facilitate identification of the alignment of the extensive intermolecular interactions.
