Table 2.

Comparison of OR, V1R, V2R, and T2R gene families

	OR	V1R	V2R	T2R
# of intact genes in 17 Hystricomorpha	13,597	1,237	761	517
Mean # of genes per species	800	72.7	44.8	30.4
Coefficient of variation of # of genes per species	0.415	0.452	0.612	0.268
# of OGGs	654	33	8	21
Mean # of genes per OGG	20.8	37.5	95.1	24.6
Maximum # of genes per OGG	373	191	608	112
Standard deviation of # of genes per OGG	31.2	48.1	208	26.1
Rate of gene gain per gene	0.388	0.656	1.656	0.254
Rate of gene loss per gene	0.361	0.460	0.443	0.261