Table 1.

Raw SNP counts, mutation rates, and expected GC equilibrium values for synonymous (S), nonsynonymous (NS), and intergenic (IG) sites

	Counts		Rates		Current GC	GCeq
	Number of GC → AT	Number of AT → GC	rGC→AT	rAT→GC
S	54 (43–67)	31 (22–40)	1.9 × 10−3	1.9 × 10−3	63	50 (40–58)
NS	40 (29–51)	19 (12–26)	8.0 × 10−4	4.9 × 10−4	56	38 (27–50)
IG	12 (7–19)	6 (2–10)	2.6 × 10−3	1.7 × 10−3	56	39 (17–56)
All	106 (89–122)	56 (44–68)	1.3 × 10−3	9.5 × 10−4	58	42 (36–49)

Note.—The numbers in parentheses are 95% confidence intervals; significant values are bolded. The values do not sum to 167 because five SNPs did not alter the GC content (i.e., a G to C mutation).