Assertion: lignin's number | /r/CapableOf | cast doubt
Facets:
value: on this route
type: LOCATION
Source sentences:
text: However, a number of in vitro enzymatic assays with heterologously produced enzymes, the identification of novel genes implicated in the pathway, and analyses of mutant and transgenic plants modified in monolignol biosynthesis have cast doubt on this route, and the pathway had to be redrawn (67).