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Complementation of the T4 am20 mutants by plasmid-borne expression. Diluted phage stocks were spotted onto top agar containing a lawn of E. coli B cells bearing the following plasmids: pT20-40 (A), pT20s-40 (B), pET20-40 (C), and pT20gfp-40 (D). For a control, E. coli CR and B with no plasmid were tested as plating bacteria (E, F).
