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Schematic illustration of apo-ERA. The crystal structure of apo-ERA (Escherichia coli Ras-like protein) was determined at 2.4-Å resolution (PDB: 1EGA). Helices are illustrated as green spirals, strands as red arrows and loops as orange pipes. The C-terminal domain is shown above the N-terminal domain. (Xin Chen et al. Proc. Natl. Acad. Sci. USA 96:8396-8410, 1999. PubMed: 10411886).