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A possible structural model for α-zeins (Z22). Each of the tandem repeat units formed by a single α-helix is presented by the cylinder and glutamine-rich “turns” or loops joining them by the curve. The anti-parallel helices of tandem repeats stack linearly in the direction perpendicular to the helical axis (the c-axis). Reprinted with permission from [5,33]. Copyright 2008, Elsevier.
