TABLE 1.

Genetic alterations found in T7 suppressor phages^a

Trial	Suppressor no.	Genetic alteration (nt)b	Outcome in gene expression
A	1	T10422C	gp3 F56L
B	2
	3
C	4	A10482G	gp3 K76E
	5	A10575G	gp3 T107A
		T10666C	gp3 V137A
	6	Δ10132	Frameshift in gene 2.8
	7	Δ10132	Frameshift in gene 2.8
	8	Δ11195-11196	Deletion in noncoding region between genes 3.5 and 3.8
	9	Δ11195-11196	Deletion in noncoding region between genes 3.5 and 3.8
	10	Δ11195-11196	Deletion in noncoding region between genes 3.5 and 3.8

^aA total 10 suppressor phages were isolated from three independent trials, and their DNA sequences in class II genes (gene 1.4 to gene 6.3) were analyzed. Genetic changes found from the phages and their consequences in gene expression are indicated.

^bnt, nucleotide.