Table 4.

The confidence interval of the α value in a Γ distribution of each group. Estimates based on the select-genes tree and the common-genes tree are shown.

Group	Taxa	Lower Boundary*		α value		Upper Boundary*
		Select	Common	Select	Common	Select	Common
Bacillus	13	0.38	0.38	0.39	0.39	0.40	0.40
Brucella	4	0.029	0.026	0.053	0.035	0.066	0.042
Burkholderia	7	0.32	0.17	0.35	0.18	0.37	0.19
Candidatus	4	108	108	∞	∞	-	-
Chlamydophila	7	0.28	0.28	0.41	0.39	0.57	0.59
Clostridium	5	0.44	0.47	0.50	0.52	0.56	0.58
Corynebacterium	5	0.56	0.84	0.79	1.19	1.03	1.71
Ehrlichia	5	0.39	0.39	∞	∞	-	-
Escherichia	7	0.20	0.26	0.23	0.31	0.27	0.35
Helicobacter	5	0.39	0.45	0.47	0.52	0.56	0.63
Lactobacillus	6	11	12	∞	∞	-	-
Mycobacterium	6	0.38	0.22	0.41	0.23	0.49	0.25
Mycoplasma	12	67	72	∞	∞	-	-
Prochlorococcus	5	1.40	1.51	2.42	2.56	4.45	4.45
Pseudomonas	8	1.22	1.52	1.66	1.91	1.62	2.14
Rhodopseudomonas	4	0.49	0.44	0.59	0.52	0.75	0.66
Rickettsia	5	0.27	0.28	0.33	0.35	0.42	0.41
Salmonella	5	0.30	0.071	0.37	0.080	0.46	0.10
Shigella	6	0.31	0.15	0.37	0.17	0.41	0.19
Staphylococcus	13	0.081	0.080	0.090	0.085	0.099	0.090
Streptococcus	19	0.31	0.28	0.34	0.29	0.35	0.32
Synechococcus	5	108	108	∞	∞	-	-
Vibrio	5	0.19	0.16	0.21	0.17	0.24	0.19
Xanthomonas	6	0.29	0.52	0.33	0.59	0.37	0.70
Yersinia	6	0.054	0.053	0.064	0.060	0.077	0.071

*at 5% level, and the lower boundary of any ∞ α value is shown in integers except in the Ehrlichia group, which has a lower boundary 0.39.