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Hypothetical model of a large nascent HDL that contains more than two copies of apoA-I. Protein arrangement around the perimeter of a particle containing four copies of apoA-I in two antiparallel dimers with 5/5′ helix register and head-to-tail dimer packing is illustrated (top view). Other dimer-based models, with N-terminal segments partially folded back, or monomer-based models with apoA-I in a double-hairpin conformation (Fig. 6C, bottom) can also be envisioned.
