Soybean (Glycine max) expansin gene superfamily origins: segmental and tandem duplication events followed by divergent selection among subfamilies

Table 6 Parameters estimation and likelihood ratio tests for the branch-site models

Cluster	Site class	Proportion	Backgroudɯ	Foregroudɯ	Positive selected sites^a
EXPA	0	0.69757	0.12227	0.12227	56Q,133 L,166S,169N,186A,172 L,174 T,190S,198S,203Q
	1	0.07472	1	1
	2a	0.20568	0.12227	1.32036
	2b	0.02203	1	1.32036
EXPB	0	0.70168	0.12941	0.12941	none
	1	0.08281	1	1
	2a	0.19276	0.12941	999
	2b	0.02275	1	999
EXLA	0	0.43399	0.12875	0.12875	none
	1	0.05093	1	1
	2a	0.46097	0.12875	999
	2b	0.0541	1	999
EXLB	0	0.49513	0.12363	0.12363	192 T*
	1	0.05939	1	1
	2a	0.39777	0.12363	999
	2b	0.04771	1	999

Note: ^aPositive-selection sites are inferred at posterior probabilities > 95% with those reaching 99% shown in bold.
*Sites were also found to be implicated in the functional divergence.

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