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Examples of simple bead models of a clathrin triskelion. (a) Leg-bend angle, φ, and (b) pucker angle, ψ, were varied from 30° to 180° and 30° to 90°, respectively. (c) Swivel angle, χ, was varied parametrically with the pucker angle according to the equation χ = 3(ψ − 30)/2, where χ is measured from the vertical axis shown in b.
