Table 2. Population genetic parameters estimated for coding regions of the U.S. CMV isolates using the DnaSP and MEGA programs.

Genomic region	Number of isolates	1S	2η	3π	4	5dS	6dN	7ω (dN/dS)
1a	24	65	66	0.014	0.017	0.037±0.006	0.005±0.002	0.13
2a	27	65	67	0.032	0.030	0.066±0.012	0.020±0.005	0.30
2b	28	76	79	0.058	0.059	0.100±0.021	0.045±0.009	0.45
MP	26	117	124	0.036	0.036	0.098±0.012	0.010±0.002	0.10
CP	26	72	76	0.030	0.028	0.088±0.012	0.006±0.002	0.07
3′NTR (RNA3)	28	54	56	0.050	0.046	n/a	n/a	n/a

¹Total number of segregating sites.

²Total number of mutations.

³Nucleotide Diversity, average pairwise nucleotide difference per site.

⁴Mutation rate estimated from S.

⁵The average number of pairwise differences per synonymous site.

⁶The average number of pairwise differences per non-synonymous site.

⁷dS and dN were estimated by Kumar method.