(2-Aminoethyl)phosphonic acid (2-Aminoethylphosphonic acid) is primarily detected in urine. (2-Aminoethyl)phosphonic acid participates in many enzymatic reactions and is also the parent compound of other transformation products, including but not limited to ceramide 2-(methylamino)ethylphosphonate, N-(2-phosphineethyl)cholamide and CMP-2-aminoethylphosphonate.