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Schematic representation of the coordinate frames in which the orientation and dynamics of pin2 were defined. The bilayer normal D is perpendicular to the magnetic field Bo. D is identical to the average helix axis. The value β is the tilt angle of helix axis (Z) from D. Z is identical to the δ22 principal axis of C=O chemical shift tensor. The value α is the angle between a peptide plane and a Z–D plane.
