Click or drag on the Ramachandran plot to place a residue. Allowed regions are shown — α-helix (φ≈−57°, ψ≈−47°), β-sheet (φ≈−120°, ψ≈+120°). Glycine is fully flexible; proline is restricted.
Backbone Viewer — 3D projection
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30°
α-helix: 3.6 residues per turn, rise 1.5 Å/residue, H-bonds within same chain (i to i+4). Right-handed helix.