6BRH:
reference: The SAM domain of mouse SAMHD1 is critical for its activation and regulation., Buzovetsky O, Tang C, Knecht KM, Antonucci JM, Wu L, Ji X, Xiong Y, Nat Commun. 2018 Jan 29;9(1):411. doi: 10.1038/s41467-017-02783-8. PMID: 29379009

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