Assertion: adenosine's receptor | /r/HasProperty | xu et al.
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text: It is the only receptor for which structures of three distinct activation states have been reported, namely the inactive conformation bound to an antagonist or inverse agonist (Jaakola et al., 2008), an intermediate-active conformation bound to an agonist (Lebon et al., 2011b; Xu et al., 2011), and the active conformation bound to both an agonist and engineered G protein (Carpenter et al., 2016).