Table 2.

Number of duplicated versus single-copy positively selected exons

	Duplicated	Single copy	Total	P-value (Fisher exact test)
All
Positively selected	41	33	74
Not positively selected	10,593	167,628	178,221
Total	10,634	167,661	178,295	9.26E-31
Non-redundant set
Positively selected	25	33	58
Not positively selected	3,096	167,627	170,723
Total	3,121	167,660	170,781	3.13E-28

Fisher's exact test for the whole set of positive genes (All) and using a nonredundant list of exons (Non-redundant set).