Table 2.

Duplicated gene pairs in the StSOT gene family and Ka/Ks analysis. Multiple duplication/triplication events were identified in five categories (in different colors in the chromosomal map in Figure 4).

Duplicated Gene Pairs		Duplication Type	Ka	Ks	Ka/Ks	Date (Million Years Ago) a
1	StSOT07-StSOT08	Segmental	0.0213	0.075	0.284	5.769
2	StSOT10-StSOT13	Segmental	0.003	0.006	0.448	0.461
	StSOT10-StSOT13-StSOT15		0.010	0.042	0.244	3.230
3	StSOT26-StSOT27	Segmental	0.014	0.057	0.254	4.384
	StSOT14-StSOT26-StSOT27		0.010	0.033	0.317	2.538
4	StSOT16-StSOT22	Segmental	0.015	0.063	0.252	4.846
5	StSOT19-StSOT20	Segmental	0.016	0.029	0.544	2.230
	StSOT18-StSOT19-StSOT20		0.010	0.045	0.228	3.461
	StSOT19- StSOT20-StSOT29		0.006	0.024	0.275	1.846

^a Duplication and divergence time (million years ago) were computed based on the T= [Ks/2λ (λ = 6.5 × 10⁻⁹)] × 10⁻⁶ formula.