Table 1.

Bacterial strains, plasmids, and phage

	Relevant genotype	Ref.
Strain
GM30	dcm+, vsr+, supE44, thr-1, leuB6, hisG4	13
GM31	As GM30, but dcm-6	1
GM2142	As GM31, but supE+	13
RP4182	Δ(dcm, vsr) his−, trpA−	16
Plasmid
pDCM21	dcm+, ampR	11
pKanS-D94	kanS, ampR	17
Phage
λKanS	kanS, cIind−	This paper
λN−KanR	Nam53, cIts857, kanR	This paper