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Created page with "== Introduction == The adenosine receptor is a class of G protein-coupled receptors (GPCRs) with adenosine as the endogenous ligand. These receptors are involved in a wide range of physiological processes, including modulation of neurotransmission, regulation of myocardial oxygen consumption, and promotion of sleep. There are four known adenosine receptor subtypes: A1, A2A, A2B, and A3, each with distinct tissue distributions and functions. == Receptor Subtypes ==..."
