Table 1.

Proportions of three intron phases

Species	Intron phases, %			Intron number	Gene number	P
	0	1	2
A. thaliana	56	23	21	1342	300	2.93 × 10−68
S. cerevisiae	39	35	26	163	160	0.11
S. pombe	45	29	26	796	364	1.46 × 10−11
C. elegans	47	29	24	1096	195	1.23 × 10−21
D. melanogaster	46	31	23	1145	385	4.73 × 10−21
H. sapiens	44	36	20	7743	1301	1.99 × 10−151