TABLE 1.

Synonymous and non-synonymous divergence within the Midline1 (Mid1) coding region.

Exons	Na	Comparison	Ka	SE	Ks	SE	Ka/Ks
2–3	245	Cast./Spret.	0.032	±0.009	0.125	±0.027	0.256
		Musc./Spret.	0.002	±0.002	0.019	±0.014	0.105
		Dom./Spret.	0.002	±0.002	0.019	±0.014	0.105
		BL6/Spret.	0.002	±0.002	0.019	±0.014	0.105
4–6	170	Cast./Spret.	0.025	±0.008	0.416	±0.079	0.060
		Musc./Spret.	0.025	±0.003	0.132	±0.033	0.189
		Dom./Spret.	0.025	±0.003	0.132	±0.033	0.189
		BL6/Spret.	0.025	±0.003	0.132	±0.033	0.189
7–10	235	Cast./Spret.	0.079	±0.017	0.857	±0.213	0.092
		Musc./Spret.	0.049	±0.009	0.597	±0.095	0.082
		Dom./Spret.	0.049	±0.009	0.597	±0.095	0.082
		BL6/Spret.	0.049	±0.009	0.597	±0.095	0.082

^aTotal number of codons.