FIGURE 2.

Scheme for the construction of an intact antibody model. (a) A model with a 4-4-8 hinge arrangement. (b) The position of the center of the symmetrical axis of the ellipsoid is represented as the Cartesian coordinates (x_c,y_c,z_c) and two spherical-polar angles (θ and ϕ). The value θ is the angle subtended by the main particle axis and the Z axis, and ϕ is the angle subtended by the projection of the main particle axis on the (X,Y) plane and the X axis. Figure adapted from Lu et al. (39).