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Molecular structure and morphology of helical macromolecules. (A) The PEO monoclinic unit cell, projected onto a plane perpendicular to the c-axis. The lattice parameters are a = 8.05 Å, b = 13.04 Å, and c = 19.48 Å with β = 125.4°, where β is the angle between the a- and c-axes. (B) Side view of left- and right-handed helices.
