1AC7:
reference: Structural features of the DNA hairpin d(ATCCTA-GTTA-TAGGAT): formation of a G-A base pair in the loop., van Dongen MJ, Mooren MM, Willems EF, van der Marel GA, van Boom JH, Wijmenga SS, Hilbers CW, Nucleic Acids Res 1997 Apr 15;25(8):1537-47. PMID: 9092659

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