2ZQB:
reference: Destabilization of psychrotrophic RNase HI in a localized fashion as revealed by mutational and X-ray crystallographic analyses., Rohman MS, Tadokoro T, Angkawidjaja C, Abe Y, Matsumura H, Koga Y, Takano K, Kanaya S, FEBS J. 2009 Jan;276(2):603-13. Epub 2008 Dec 12. PMID: 19120449

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