Extracellularly, ATP has been found to act as a [[neurotransmitter]]. ATP receptors are widespread throughout the body. On its own it is known to have effects on the arteries, intestines, lungs, and bladder. It may also be released in tandem with other neurotransmitters.
[[Image:Atp.gif|Adenosine Triphosphate (ATP, fully protonated)]]
==Structure==