P2X purinoreceptors are a family of protein receptors that are part of the purinergic signaling system. They are ionotropic receptors that are activated by extracellular ATP (adenosine triphosphate) and belong to the larger family of purinergic receptors, which also includes P1 receptors (adenosine receptors). P2X receptors are trimeric proteins, meaning they are composed of three subunits that come together to form a functional ion channel.
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