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Different C-terminal β-helical threads accommodating 0 or 1. Depending upon the positions of the N-linking asparagines (pointing in or out, highlighted in green) the C-terminal β helix can accommodate 0 (C4U),1(C4M1) or 2 sugars(C4D, c.f. Fig. 5). Cysteines are highlighted in yellow, glutamates in red.
