Assertion: adenosine's role | /r/HasProperty | guo et al.
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text: Crystallographic studies have also highlighted the role that ECL2 and ECL3 play in ligand binding, specifically the effect of the salt bridge between E169ECL2 and H264ECL3 (Lebon et al., 2015; Guo et al., 2016; Segala et al., 2016).