4PQZ:
reference: High-resolution crystal structure reveals a HEPN domain at the C-terminal region of S. cerevisiae RNA endonuclease Swt1., Peng S, Zhou K, Wang W, Gao Z, Dong Y, Liu Q, Biochem Biophys Res Commun. 2014 Oct 16;453(4):826-832. doi:, 10.1016/j.bbrc.2014.10.040. PMID: 25450355

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