Table 1.

The statistics of non-pseudogenetic duplicate pairs at six stages

Stages	Range of Ks	Time (MYA)	Duplicate pairsa	Non-differentiated pairs	Differentiated pairs	Rate of differentiated pairs (%)	Neo-pairs	Subpairs	Rate of neo- in differentiated pairs (%)
I	= 0	Recent	1899	1891	8	0.42	0	8	0
II	0–0.0072	0–0.55	5	3	2	40	0	2	0
III	0.0072–0.0313	0.55–2.41	417	395	22	5.28	9	13	40.91
IV	0.0313–0.0879	2.41–6.76	1351	1181	170	12.58	103	67	60.59
V	0.0879–0.195	6.76–15	1369	1132	237	17.31	89	148	37.55
VI	> 0.195	>  15	297	271	26	8.75	25	1	96.15
Total	–	–	5338	4873	465	8.71	226	239	48.60

^aA gene with a copy number of 3 will derive three duplicate pairs. And the genes with CDS length < 150 bp were excluded