Figure 2: Superposition of the experimentally determined CrSAS-6-6HR ring structure with the coarse-grained model for three SAS-6-6HR homodimers, each consisting of five spheres.
From: Computational support for a scaffolding mechanism of centriole assembly

In the model the two globular N-term domains are described by a dumbbell consisting of two spheres of sizes RN = 1.979 nm and the first six heptad repeats by a string of three spheres of size RCC = 1.182 nm. In our coarse-grained model the ninefold planar ring structure is encoded by the center-to-center vectors and the torsion vectors
, as indicated in the figure.