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Coiled-coil interactions in higher oligomers. Type N represents the standard model. Type I helices interact through two hydrophobic seams that share a central position; Type II helices through two adjacent seams; and Type III helices through seams separated by one position (which projects into the pore of the barrel). Note that this figure does not show all helices of the oligomers. Reprinted with permission from ref (637). Copyright 2017 Elsevier.
