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Electron micrographs of the polysheaths formed by wild-type recombinant gp053 from phage FV3. The samples of the purified polysheaths were analysed immediately after purification (A,B), following storage in TE buffer at 4 °C for 12 months (C), after treatment with trypsin (0.02 mg/mL) at 22 °C for 16 h (D), after incubation in the presence of 8 M urea at 22 °C for 16 h (E), and after incubation in boiling water for 30 min (F).
