(A–E) Guinier plots of apoD bound to a ligand or oxidised apoD. Linear regression showed no up- or down-turn of the curve, indicating no aggregation or inter-particle repulsion. (F–J) P(r) functions of apoD bound to a ligand or oxidised apoD displayed a symmetric profile indicative of a mainly globular scattering molecule. All curves approach zero smoothly at high q, indicating the absence of inter-particle repulsion. Error bars in P(r) functions are based on counting statistics and error bars are not shown if they are smaller than symbol sizes.