157D:
reference: Crystal and molecular structure of r(CGCGAAUUAGCG): an RNA duplex containing two G(anti).A(anti) base pairs., Leonard GA, McAuley-Hecht KE, Ebel S, Lough DM, Brown T, Hunter WN, Structure 1994 Jun 15;2(6):483-94. PMID: 7922026

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