1K4S: Human Dna Topoisomerase I In Covalent Complex With A 22 Base Pair Dna Duplex
reference: The mechanism of topoisomerase I poisoning by a camptothecin analog., Staker BL, Hjerrild K, Feese MD, Behnke CA, Burgin AB Jr, Stewart L, Proc Natl Acad Sci U S A 2002 Nov 26;99(24):15387-92. Epub 2002 Nov 8. PMID: 12426403

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