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The structure of the collagen polypeptide contains three helical strands. The strands are made up of proline-proline-glycine amino acid subunits.
The model was built using ChimeraX from X-ray diffraction crystal structure data in the Protein Data Bank (PDB ID 1K6F).
DOI: 10.2210/pdb1K6F/pdb & https://www.cgl.ucsf.edu/chimerax/
‘Crystal structure of the collagen triple helix model.’ Berisio, R., Vitagliano, L., Mazzarella, L., Zagari, A. (2002) Protein Sci 11: 262-270
PubMed: 11790836 DOI: 10.1110/ps.32602