Active Motif's LightSwitch Luciferase Assay System is comprehensive system for studying transcriptional and post-transcriptional regulation. It includes over 30,000 pre-cloned promoter and 3'UTR sequences that have been cloned from the human genome, which are assayed using optimized reagents and protocols that make every step of the procedure faster and simpler. The LightSwitch Luciferase Assay Kit contains a novel, proprietary assay substrate that was formulated to provide high sensitivity and a broad dynamic range when assaying the engineered RenSP luciferase gene found in all LightSwitch reporter constructs.