An electron density map has been calculated at a resolution of 2.8 Å which shows many details of the arrangement of the atoms in rhombohedral crystals of insulin.

b The rhombohedral structure of van der Waals crystal CrBr3 of R3¯ symmetry. The unit cell (a), top view (b) and side view of a single layer (c) are shown. c The Cr3+-ordered magnetic moment as ...