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Angle formed by the helix with the membrane normal in simulation PER1. With respect to the interface normal, 0° is perpendicular and 90° is parallel. The helix tilt angle is calculated by measuring the angle between the vertical z axis and the line formed by the Cα atoms of residues C-8 and I-22. This shows that the peptide moves from an initial position that is perpendicular to the lipid/water interface to a final position that is mostly parallel to the lipid/water interface.
