TABLE 2.

Number of nucleotide substitutions per site between Gambian SIVagmSab strains and groups of other SIVagm strains for gag, pol, and env genes^a

Gene	Avg no. of nucleotide substitutions ± SE
	SIVagmVer	SIVagmGrv	SIVagmTan	SIVagmSab
gag	0.389 ± 0.037	0.467 ± 0.045	0.430 ± 0.042	0.162 ± 0.016
pol	0.321 ± 0.022	0.334 ± 0.025	0.312 ± 0.023	0.206 ± 0.016
env	0.423 ± 0.018	0.408 ± 0.019	0.427 ± 0.022	0.235 ± 0.013

^aData were obtained by averaging over all sequence pairs. Standard error estimates were obtained by a bootstrap procedure (500 replicates). Analyses were conducted using the maximum composite likelihood model (100) as implemented in MEGA5 (101).