Table 2. . The GSTZ1-1 human polymorphic variants and their approximate frequency in the population.

Variant	Nucleotide position			Amino acid position			Percentage in population(%)†
	94	124	245	32	42	82
GSTZ1A	A	A	C	Lys (K)	Arg (R)	Thr (T)	1–10
GSTZ1B	A	G	C	Lys (K)	Gly (G)	Thr (T)	25–35
GSTZ1C	G	G	C	Glu (E)	Gly (G)	Thr (T)	45–55
GSTZ1D	G	G	T	Glu (E)	Gly (G)	Met (M)	10–20
GSTZ1F	A	G	T	Lys (K)	Gly (G)	Met (M)	<1

^†The incidence of each haplotype varies with ethnic group, see Figure 2 and [54–56].

Glu (E): Glutamic acid; Gly (G): Glycine; Lys (K): Lysine: Met (M): Methionine; Thr (T): Threonine.