Assertion: serine's role | /r/CapableOf | remain unclear
Facets:
value: as of 2015
type: TEMPORAL
Source sentences:
text: The above results demonstrated that sdaC played a significant role in the l-serine uptake system, but the roles of cycA, sstT and tdcC in the uptake system remained unclear.
text: Certain mutations that disturb choline metabolism increase the prevalence of NTDs in newborns, but the role of dietary choline deficiency remains unclear, as of 2015.