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Model prokaryotes are extensively studied prokaryotes (bacteria and archaea) chosen as tools for molecular biology or biotechnology, for their role as disease agents, or for the ease of investigating particular biological phenomena.
In bacteria, the tubulin-related GTPase FtsZ and the actin-related protein FtsA cooperate to form the Z-ring required for cytokinesis. Loose and Mitchison now show that FtsZ and FtsA can self-organize into dynamic structures in vitro, providing insights into the potential regulatory interplay of the two proteins.