3O7V:
reference: Inaugural Article: Structural basis for piRNA 2'-O-methylated 3'-end recognition by Piwi PAZ (Piwi/Argonaute/Zwille) domains., Tian Y, Simanshu DK, Ma JB, Patel DJ, Proc Natl Acad Sci U S A. 2010 Dec 30. PMID: 21193640

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