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(A) Swarming motility of P. syringae pv. syringae B728a (PssB728a), relA, spoT, and relA/spoT mutant strains on swarming plates (KB containing 0.4% agar) 24 h post inoculation. (B) Swarming motility of PssB728a, relA, spoT, and relA/spoT mutant strains constitutively over-expressing salA gene on KB swarming plates for 24 h. The experiments were repeated at least three times with similar results.
