1CVY:
reference: Structural effects of DNA sequence on T.A recognition by hydroxypyrrole/pyrrole pairs in the minor groove., Kielkopf CL, Bremer RE, White S, Szewczyk JW, Turner JM, Baird EE, Dervan PB, Rees DC, J Mol Biol 2000 Jan 21;295(3):557-67. PMID: 10623546

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