Assertion: collagen's structure | /r/HasProperty | refined by crick
Facets:
value: in 1955
type: TEMPORAL
value: to become
type: PURPOSE
Source sentences:
text: Astbury and Bell in 19402 were the first to describe it; however, with developments in science, improvements in its structure were made, and finally, in 1955, this structure was refined by Rich and Crick and by North and coworkers to become the triple helical structure accepted today.3