1YSF:
reference: AbrB-like Transcription Factors Assume a Swapped Hairpin Fold that Is Evolutionarily Related to Double-Psi beta Barrels., Coles M, Djuranovic S, Soding J, Frickey T, Koretke K, Truffault V, Martin J, Lupas AN, Structure (Camb) 2005 Jun;13(6):919-28. PMID: 15939023

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