Structure of Collagen

@article{Ramachandran1954StructureOC,
  title={Structure of Collagen},
  author={G. N. Ramachandran and Gopinath Kartha},
  journal={Nature},
  year={1954},
  volume={174},
  pages={269-270}
}
A DETAILED X-ray study of collagen fibres obtained from different sources (namely, shark ray, rat tail tendon and kangaroo tail tendon) and a re-examination of the published wide-angle patterns indicate that the unit cell of collagen is hexagonal with a = 12–16 A. and c = 9.5–9 A., the actual values depending on the moisture content. The essential difference of this indexing from those reported earlier1–3 is that the 2.86-A. meridional arc is here interpreted not as a true meridional reflexion… 
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