Tutorial: The Ramachandran principle, phi (φ) and psi (ψ) angles in proteins
by Eric Martz
The Ramachandran Principle says that alpha helices, beta strands, and turns are the most likely conformations for a polypeptide chain to adopt, because most other conformations are impossible due to steric collisions between atoms.
Check Show Clashes to see where non-bonded atoms are overlapping, and thus in physically impossible positions.
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