This product includes all the reagents for 100 samples in gel-based assays of E. coli topo I DNA relaxation activity. It This product includes 300 µl of 10 x Buffer T1, 100 µl of 250 mg/ml supercoiled DNA, 550 µl of 5 x Gel loading buffer and 10 µl of 4 µM E. coli topoisomerase I enzyme.