3M3N:
reference: Structure of a Longitudinal Actin Dimer Assembled by Tandem W Domains: Implications for Actin Filament Nucleation., Rebowski G, Namgoong S, Boczkowska M, Leavis PC, Navaza J, Dominguez R, J Mol Biol. 2010 Sep 6. PMID: 20804767

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