2KRC:
reference: Solution structure of the N-terminal domain of Bacillus subtilis delta subunit of RNA polymerase and its classification based on structural homologs., Motackova V, Sanderova H, Zidek L, Novacek J, Padrta P, Svenkova A, Korelusova J, Jonak J, Krasny L, Sklenar V, Proteins. 2010 Mar 1. PMID: 20310067

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