Assertion: adenosine | /r/HasAspect | more affinity
Facets:
value: for the a1r
type: OTHER
Source sentences:
text: As mentioned above, the A1R-A2AR heterotetramer acts as a concentration-dependent switch, since adenosine has more affinity for the A1R than for the A2AR, allowing low concentrations of adenosine to inhibit and high concentrations to stimulate striatal glutamate release, by activating A1R and A2AR, respectively (Ciruela et al., 2006).