Assertion: tryptophan's level | /r/HasProperty | biochemical marker
Facets:
value: for cellular immune activation
type: PURPOSE
Source sentences:
text: These lower levels may be regarded as a biochemical marker for cellular immune activation, which may lead to increased catabolism of tryptophan into kynurenine via stimulation of the enzyme indoleamine 2,3-dioxygenase (IDO) by interferon-γ.