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Expansion and retraction of the G tract in pglX and its effect on plaque formation by φC31. (A) Resistance and sensitivity of M145 and M145 Pgl− to φC31cΔ25. (B and C) Presence of eight G residues (B) and nine G residues (C) in the variable G tract in the pglX gene in M145 and M145 Pgl−, respectively. All other Pgl+ strains tested gave sequence chromatographs identical to that shown in panel B. (D) Pgl− strain J1902 was the only strain to contain seven G residues (D).
