2KZZ: Klenow Fragment With Normal Substrate And Zinc Only
reference: Structures of normal single-stranded DNA and deoxyribo-3'-S-phosphorothiolates bound to the 3'-5' exonucleolytic active site of DNA polymerase I from Escherichia coli., Brautigam CA, Sun S, Piccirilli JA, Steitz TA, Biochemistry 1999 Jan 12;38(2):696-704. PMID: 9888810

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