This product includes 4800 ul of 10 x Buffer HT1, 4050 ul of 10 x supercoiled plasmid DNA, 40 ul of 1000 x human topoisomerase I enzyme (500U/ul), 57 ul of 4500 x Dye H19 and 30 ml of 10 x H19 dilution buffer. This product includes all the reagents for 1000 DNA relaxation assays in a 96-well plate format or 2000 assays in a 384-well assay format.