The Transcreener(R) UDP2 TR-FRET Red Assay is a competitive immunoassay for UDP with a far-red time-resolved Foumlrster-resonance-energy-transfer (TR-FRET) readout. Because it is highly selective for UDP the assay can be used with any enzyme that generates UDP from a UDP-sugar donor. Examples include glycosyltransferase galactosyltransferase glucuronyltransferase N-acetylglucosamyltransferase N-acetylgalactosyltransferase xylosyltransferase and glycogen cellulose lactose and hyaluronan synthases. The Transcreener(R) assay is designed specifically for high-throughput screening (HTS) with a single-addition mix-and-read format. It offers reagent stability and compatibility with commonly used multimode plate readers. The generic nature of the Transcreener(R) HTS assay platform eliminates delays involved in assay development for new HTS targets and greatly simplifies compound and inhibitor profiling across multiple target families. The Transcreener(R) UDP2 TR-FRET Red Assay pro