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Correlation of ring pucker with collagen triple helix stability (Inouye et al. 1976; Bretscher et al. 2001; DeRider et al. 2002). In a crystalline triple helix, proline residues have ϕ = –73°, ψ = 164° in the Xaa position, and ϕ = –60°, ψ = 150° in the Yaa position (Bella et al. 1994).
