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Electron micrographs of enterocoliticin particles after negative staining. (A) Extended and contracted phage tail-like structures. (B) Higher magnification of enterocoliticin particles with different structural elements, showing the similarity to the architecture of phage tails (ex, extended particles; c, contracted particles; sh, sheath; co, core). (Inset) Particles with base plate (bp) and spikes (s).
