| http://www.w3.org/ns/prov#value | - The relative orientation of the axis of an ??-helix with respect to the central axis of the plane formed by the ??-sheet can be specified in terms of two parameters, namely, the horizontal projected angle ?????? and the distance between the midpoints, DM, i.e. representing the distance from the origin of the ??-sheet coordinate system to the midpoint of the ??-helix.
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