Table 2.

List of strains used in the Ames test

Strains	Characteristics	Genetic variation		Source
S. typhimurium		NR	pKM101
TA1535	hisG46 ^a), gal, Δ(chl, uvrB, bio) rfa	Wild type	No	[26]
TA100	Same as TA1535, but harbours pKM101; Ap^{r b)}	Wild type	Yes	[10]
TA1538	Same as TA1535, but hisD3052 ^c) instead of hisG46	Wild type	No	[26]
TA98	Same as TA1538, but harbours pKM101; Ap^r	Wild type	Yes	[10]
YG7127	Same as TA1535, but an nfsB gene is deleted; Km^{r d)}	Deleted	No	[20]
YG7128	Same as YG7127, but harbours pKM101; Ap^r, Km^r	Deleted	Yes	[20]
YG7131	Same as TA1538, but an nfsB gene is deleted; Km^r	Deleted	No	[20]
YG7132	Same as YG7131, but harbours pKM101; Ap^r, Km^r	Deleted	Yes	[20]

a) hisG46 is a base-substitution mutation, CTC to CCC, at the 69th codon of the hisG gene

b) Ap^r means ampicillin resistant

c) hisD3052 is a frameshift mutation, CGCGCG to CGCGCGCG, in the hisD gene

d) Km^r means kanamycin resistant