1RDB:
reference: Crystal structures of ribonuclease HI active site mutants from Escherichia coli., Katayanagi K, Ishikawa M, Okumura M, Ariyoshi M, Kanaya S, Kawano Y, Suzuki M, Tanaka I, Morikawa K, J Biol Chem 1993 Oct 15;268(29):22092-9. PMID: 8408067

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