Assertion: estrone | /r/HasProperty | purified by allen
Facets:
value: independently
type: MANNER
value: in 1929
type: TEMPORAL
Source sentences:
text: Estrone was isolated and purified independently by Allen and Doisy and German scientist Adolf Butenandt in 1929, and estriol was isolated and purified by Marrian in 1930; they were the first estrogens to be identified.