2d17 is a 2 chain structure. Full experimental information is available from OCA.
Reference
Baba S, Takahashi K, Noguchi S, Takaku H, Koyanagi Y, Yamamoto N, Kawai G. Solution RNA structures of the HIV-1 dimerization initiation site in the kissing-loop and extended-duplex dimers. J Biochem. 2005 Nov;138(5):583-92. PMID:16272570 doi:138/5/583
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