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ribbons (34) representation illustrating the elliptical and curved shape of the apo Δ(1–43)A-I tetramer. (a) The tetramer is shown with the three noncrystallographic (pseudo)dyads: molecule A is gold, molecule B is purple, molecule C is pink, and molecule D is green. (b) View down the A/C dyad. (c) As in b, rotated 90° around the horizontal axis—i.e., viewed down the A/D pseudo-dyad. (d) As in c, rotated ≈70° around the vertical axis.
