Nucleotides are composed of a nitrogenous base covalently bound to a 5-carbon sugar molecule and one or more phosphate functional groups. They are the molecules that make up the structural units of DNA and RNA.
Thermo Scientific ATP (adenosine 5'-triphosphate), Tris buffered is an extremely stable nucleotide, supplied as 100 mM aqueous solution titrated to pH 7.3-7.5 with Tris base.