Assertion: adenosine | /r/CapableOf | act as direct analgesic
Facets:
value: at low concentrations
type: MANNER
Source sentences:
text: However, adenosine concentrations have a bi-modal effect: at low concentrations adenosine acts as a direct analgesic , and anti-inflammatory mediator , and at high concentrations, adenosine directly induces pain  with pro-inflammatory cytotoxic effects .