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Cross-streak analysis of wlbA (first panel) and wlbL (second panel) mutants and complemented mutants with a clear plaque-forming derivative of bacteriophage Ba1, Ba1c1. Streak 1, parental B. avium strain 197N with the vector plasmid pLAFR5. Streaks 2–6, wlb mutant (PAS85 or PAS78) complemented with pLAFR5, pLAF-av, pLAF-pe, pLAF-br or pLAF-pa respectively. The arrow denotes where phage lysates were vertically streaked prior to making the cross-streaks.
