Figure 3.

The 10 barrels in their four categories, with each row representing a class. The transmembrane region for each structure, as determined by TMDET, is shown in cartoon form. The coiled-coil regions are shown in rainbow colours, according to the assigned heptad register, with a residues in red and d residues in green. Row 1: symmetric, parallel, autonomous (2J58). Row 2: symmetric, parallel, buttressed (3UQ4, 4EV6, 4HKR, 4HW9, 4BEM). Row 3: symmetric, antiparallel, autonomous (4QND). Row 4: asymmetric, antiparallel, autonomous (4C9 J, 4IL3, 4CAD).