Assertion: phenylalanine | /r/CapableOf | serve as immediate endogenous precursor
Facets:
value: to the styrene pathway
type: TRANSITIVE-OBJECT
Source sentences:
text: As phenylalanine serves as the immediate endogenous precursor to the styrene pathway, its over-production by S. cerevisiae is an essential pre-requisite to styrene biosynthesis.