2BPA:
reference: Atomic structure of single-stranded DNA bacteriophage phi X174 and its functional implications., McKenna R, Xia D, Willingmann P, Ilag LL, Krishnaswamy S, Rossmann MG, Olson NH, Baker TS, Incardona NL, Nature 1992 Jan 9;355(6356):137-43. PMID: 1370343

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