The Water's Acutag method is used to measure amino acid profiles (20+ amino acid concentrations) and select amino acid profiles (including branch chain amino acid analysis). Also, specific activity measurement of select glucose precursors which include UDPGlu (uridine diphosphate glucose) analysis (an important intermediate in the production and utilization of glycogen) with an accompanying specific activity measurement of UDPGal (uridine diphosphate galactose), UDPG-N-acetylgalactose and UDPG-N-acetylglucose and PEP (phosphoenolpyruvate) analysis (an important step in assessing glucose metabolism from lactate). Assessment of cAMP was added to the cadre of HPLC methods in 2005.