+A2a is a specialized [receptor](/wiki/Receptor) on cell surfaces, sensitive to [adenosine](/wiki/Adenosine), a molecule vital for cellular communication. This protein acts as a subtle messenger, influencing functions within the brain, immune system, and heart. Its profound role guides processes like sleep, inflammation, and blood flow.
+## See also
+- [G Protein](/wiki/G_Protein)
+- [Neuroscience](/wiki/Neuroscience)
+- [Immunity](/wiki/Immunity)
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