(A) Small angle X-ray Scattering (SAXS) analysis of the barbell and quadrilateral shaped assemblies. +: experimental data, solid line: theoretical curve calculated by FoXS for the representative MD models shown in (C) and (D). Goodness of fit, χ2(barbell): 0.93; χ2(quadrilateral): 0.87. (B) Pair distance distribution functions of the barbell and quadrilateral shaped assemblies. Structural parameters derived from P(r) functions, Rg(barbell): 33.7 Å, dmax(barbell): 125 Å. Rg(quadrilateral): 36.5 Å, dmax(quadrilateral): 137 Å.