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A(1) adenosine receptors inhibit adenylate cyclase by activating G(i)/G(o), whereas A(2A) receptors activate G(s). We examined how regions of A(1) and A(2A) receptors regulate coupling to G-proteins by constructing chimaeras in which the third intracellular loops (3ICL or L) and/or the C-termini (or T) were switched. Pertussis toxin (PTX) was used in(More)
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