Assertion: serine | /r/HasProperty | the precursor
Facets:
value: to tryptophan in bacteria
type: OTHER
Source sentences:
text: It is the precursor to several amino acids including glycine and cysteine, as well as tryptophan in bacteria.
text: It is also the precursor to numerous other metabolites, including sphingolipids and folate, which is the principal donor of one-carbon fragments in biosynthesis.