Assertion: adenosine's role | /r/HasProperty | suggested in pain
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text: A role for adenosine A 2A receptors was also suggested in drug addiction (Ferré et al., 2007) and sensitization (Bastia et al., 2005), narcolepsy and pain (Ferré et al., 2007), and respiration in immature animals (Mayer et al., 2005).