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Electron micrographs of the partially purified sample (A), the major DEAE-eluted fraction at 0.3 M NaCl (B), and the minor DEAE-eluted fraction at 0.7 M NaCl (C). The maltocin P28 particles with different structural elements, namely, empty sheath, complete form, and complete contracted form, are marked ES, CF, and CCF, respectively. The filamentous phage is marked FP.
