Assertion: atp's effect | /r/HasProperty | inhibited by xanthine amine congener
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text: 125I efflux was also stimulated by adenosine and its receptor agonists 5′-N-ethylcar-boxamidoadenosine, N6-(2-phenylisopropyl)adenosine; these effects were inhibited by xanthine amine congener, suggesting a separate adenosine receptor.