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美國TopoGEN 
TopoGEN 公司是一家專門為拓撲酶研究提供試劑和試劑盒。試劑盒可以有效地分析拓撲異構酶 I ， II 和旋轉酶，分析細胞內的拓撲抑制以及描繪拓撲異構酶抑制劑的特性。另外公司還提供 DNa c底物，拓撲抑制劑和抗體等。

TopoGEN is a research diagnostic company that provides innovative products for researchers working with topoisomerases and engaged in mechanism based drug discovery. Kits are available to identify topoisomerase active drugs for use in cancer chemotherapy and antibacterial applications. The company also provides kits for assaying both prokaryotic and eukaryotic topoisomerases (type I, II, IV, gyrase), both in vitro and in vivo. We also offer a complete line of DNA substrates and DNA cleavage targets, topo inhibitors, antibodies, and kit replenishment reagents. The company was founded by researchers working with these enzymes and who can offer hands on assistance with your topoisomerase research, whether basic, clinical, applied or translational. TopoGEN was incorporated in 1991 and has a dedicated clientele. We offer substantial product support, data interpretation and consultation advice. We also provide contract screening services for topo poisons. Please enquire.