Table 1.

Estimated number of substitutions per site by codon position between wSuz and wSpc, plus estimates of synonymous (k _s) and nonsynonymous (k _a) substitution rates, see the text for details

Position	Point estimates	95% confidence interval
1st	5.0 × 10−5	(3.0 × 10−5, 7.0 × 10−5)
2nd	3.2 × 10−5	(1.6 × 10−5, 4.6 × 10−5)
3rd	4.0 × 10−5	(2.4 × 10−5, 5.6 × 10−5)
Overall (k s, k a)	(3 × 10−5, 4 × 10−5)