249D:
reference: Structural comparison between the d(CTAG) sequence in oligonucleotides and trp and met repressor-operator complexes., Urpi L, Tereshko V, Malinina L, Huynh-Dinh T, Subirana JA, Nat Struct Biol 1996 Apr;3(4):325-8. PMID: 8599757

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