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Actin is a rather uncommitted protein with a high degree of structural plasticity: it can adopt a variety of structural states, depending on the specific ionic conditions or the interaction with ligand proteins. These interactions lock actin into a distinct conformation, which specifies the oligomeric or polymeric form it can assume. The interplay between monomeric, oligomeric and polymeric forms...
Recent advances in electron tomography are beginning to reveal the internal structure of eukaryotic cells in their native states in three dimensions at molecular resolution. These observations represent the culmination of years of effort to develop protocols for automated data collection, image reconstruction and cryogenic preservation. Cryo-tomograms of Dictyostelium cells depict distinct populations...
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