Table 2

Parameter estimates for branch-site model A from maximum likelihood analyses.

Data Set
Foreground branch
f
l
Estimated parameters
κ
Positive selection (BEB)

RPS4Y1
Hsa Y1
14
-1275.00
p0 = 1 p1 = 0 (p2+p3 = 0), ω2 = 1
3.40

RPS4Y2
Hsa Y2
8
-1233.73
p0 = 0 p1 = 0 (p2+p3 = 1), ω2 = 139.62
3.78
68H*, 70L*, 87I*, 108C*, 185A*
RPS4X
Hsa X
10
-1100.83
p0 = 1 p1 = 0 (p2+p3 = 0), ω2 = 1
--- b

RPS4 Y1/Y2
Hsa Y2
20
-1562.15
p0 = 0 p1 = 0 (p2+p3 = 1), ω2 a
4.61
70I*, 185G*

Y2cluster
20
-1570.33
p0 = 0 p1 = 1 (p2+p3 = 1), ω2 = 139.62
4.59

RPS4 Y1/Y2/X
Hsa Y2
28
-1971.13
p0 = 0 p1 = 0 (p2+p3 = 1), ω2 a
3.21
68R*, 70I*, 87M*, 104D*, 108R*, 185G*

Y2cluster
28
-1986.19
p0 = 0.942 p1 = 0.058 (p2+p3 = 0), ω2 = 1
3.12

Y1Y2X No Hsa Y2
Y2cluster
26
-1925.91
p0 = 0.939 p1 = 0.061 (p2+p3 = 0), ω2 = 1
3.16

Y1Y2 No Hsa Y2
Y2cluster
18
-1516.95
p0 = 0.901 p1 = 0.099 (p2+p3 = 0), ω2 = 1
4.62

Y1Y2X Hsa
Hsa Y2
8
-1619.84
p0 = 0.647 p1 = 0.021 (p2+p3 = 0.332), ω2 = 1
3.03
68R, 70I, 87M, 104D, 108R, 180L, 185G, 205F, 222L (P > 0.71)

f for the number of free parameters; l for likelihood values; and κ for transitions/transversions.

* Posterior probability >0.95.

a ω cannot be estimated since there are no synonymous substitutions.

b κ cannot be estimated since there are no transversions.

Andrés et al. BMC Evolutionary Biology 2008 8:142   doi:10.1186/1471-2148-8-142