Assertion: drug's mechanism | /r/CapableOf | remain defined
Facets:
value: with release
type: TEMPORAL
value: poorly
type: DEGREE
Source sentences:
text: Its mechanism of action remains poorly defined, with GABAergic, NGF and BDNF release promoting, MT1 receptor agonism, MT3 receptor antagonism, and sigma agonism all thought to have some involvement.