Top view of the same helix shown above. Four carbonyl groups are pointing upwards towards the viewer, spaced roughly 100° apart on the circle, corresponding to 3.6 amino-acid residues per turn of the helix.

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Top view of the same helix shown above. Four carbonyl groups are pointing upwards towards the viewer, spaced roughly 100° apart on the circle, corresponding to 3.6 amino-acid residues per turn of the helix.