4QR1:
reference: Structural and functional characterization of Streptococcus pyogenes Cas2 protein under different pH conditions., Ka D, Kim D, Baek G, Bae E, Biochem Biophys Res Commun. 2014 Aug 15;451(1):152-7. doi:, 10.1016/j.bbrc.2014.07.087. Epub 2014 Jul 29. PMID: 25079131

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