4N06:
reference: Crystal structure of Cas1 from Archaeoglobus fulgidus and characterization of its nucleolytic activity., Kim TY, Shin M, Huynh Thi Yen L, Kim JS, Biochem Biophys Res Commun. 2013 Nov 29;441(4):720-5. doi:, 10.1016/j.bbrc.2013.10.122. Epub 2013 Nov 5. PMID: 24211577

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