Assertion: ligand's activity | /r/HasProperty | negligible
Facets:
value: in their absence
type: TEMPORAL
Source sentences:
text: Some allosteric activators are referred to as "essential", or "obligate" activators, in the sense that in their absence, the activity of their target enzyme activity is very low or negligible, as is the case with N-acetylglutamate's activity on carbamoyl phosphate synthetase I, for example.