Assertion: vaccine's bacteria | /r/HasProperty | propagated in bacteria
Facets:
value: before being introduced to the cell
type: TEMPORAL
Source sentences:
text: Yeast expression is unique in two ways: 1) to successfully produce a VLP using a yeast expression system, the bacteria must be propagated in bacteria before being introduced to the cell to create a stable transgene product and 2) Research has suggested that VLP assembly may occur more efficiently during the purification stage, instead of the cultivation stage.