Adenosine A2 receptor Two subtypes of adenosine A2 receptors are known. Both are G protein-coupled adenosine receptors: Adenosine A2A receptor Adenosine A2B receptor Topics referred to by the same term This disambiguation page lists articles associated with the title Adenosine A2 receptor.If an internal link led you here, you may wish to change the link to point directly to the intended article.