Assertion: collagen's type | /r/HasProperty | identified
Facets:
value: scientifically
type: MANNER
value: as of 2011
type: TEMPORAL
Source sentences:
text: However, as of 2011, 30 types of collagen have been identified, described, and divided into several groups according to the structure they form:
text: As mentioned previously, about 28 different types of collagen have already been identified.
text: While 28 different types of collagen have been scientifically identified, most supplements will contain one or more of just three of these, which are known simply as:1,2,3