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- Top view of the same helix shown above. Four carbonyl groups are pointing upwards toward the viewer, spaced roughly 100° apart on the circle, corresponding to 3.6 amino-acid residues per turn of the helix. (en)
- Side view of an α-helix of alanine residues in atomic detail. Two hydrogen bonds for the same peptide group are highlighted in magenta; the H to O distance is about . The protein chain runs upward here; that is, its N-terminus is at the bottom and its C-terminus at the top. Note that the sidechains angle slightly downward, toward the N-terminus, while the peptide oxygens point up and the peptide NHs point down. (en)
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