Figure 2.

Domain boundaries in human DNA topoisomerase I. DNA topoisomerase from human (PDB id: 1RRJ, CDD id: pfam01028). Structure domains 1, 2, 3, and 4 are shown in magenta, blue, brown, and green in the structure and domain arrangement schematic, the DNA topoisomerase catalytic sequence based domain is shown in yellow.

Thompson et al. BMC Structural Biology 2009 9:33   doi:10.1186/1472-6807-9-33
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