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Relation between the separated distance and the loss of the direction of the tangent. The relation between averaged distance 〈lm〉 and cosine angles 〈cosθm〉 of heterotrimer and homotrimer collagen molecules. The line represents the exponential fit (Eq 2.) with persistence length of 209 Å for heterotrimer collagen molecule and 89 Å for homotrimer collagen molecule.
