Fig. 2.
Detection of Pf4 phage in the supernatant of overnight cultures. Supernatants from overnight cultures of the P. aeruginosa PAO1 were spotted onto soft-agar lawns of the wild-type PAO1 (A), and the Pf4 mutant (B) and supernatants from overnight cultures of the Pf4 mutant were spotted onto either lawns of the wild-type PAO1 (C) or the ΔPf4 mutant (D).