1UHY:
reference: X-ray analyses of d(GCGAXAGC) containing G and T at X: the base-intercalated duplex is still stable even in point mutants at the fifth residue., Kondo J, Umeda SI, Fujita K, Sunami T, Takenaka A, J Synchrotron Radiat 2004 Jan 1;11(Pt 1):117-20. PMID: 14646150

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