Model Parameters for Phylogenetic Analysis
Viral gene		HIV-1-B enva		SIV envb
model class		GTR+I+G		GTR+I+G
fA		0.34857		0.3516
fC		0.17125		0.1642
fG		0.23694		0.2296
fT		0.24324		0.2546
RA<->C		1.971		1.8418
RA<->G		4.315		10.9127
RA<->T		0.8539		0.5803
RC<->G		1.021		0.9283
RC<->T		3.826		6.8499
RG<->T		1		1
p-inv		0.26035		0.471
gamma shape (α)		0.50434		0.9477

^a: Model parameters estimated using hierarchical likelihood ratio test with Modeltest, version 2.0, and PAUP* version 4.0b2.
^b: Model parameters estimated using Akaike Information Criterion (AIC) with Modeltest, version 3.06, and PAUP* version 4.0b10.