Having 'solved' the structure of polyglycine II in August of 1955 1, Alex Rich and Francis Crick realize, a month later, that they are now in a position to build a model of the structure of ...

Several polytripeptide and polyhexapeptide models of collagen have the same triple helical conformation with one NH…O interchain H bond per tripeptide. Collagen itself probably has this structure.