Table 3

Classification of S-AS pairs in reference to their orientation and the presence of introns at the genome level for both genes in a pair

NAT pair

Human

Mouse

5'5'

Embedded

3'3'

5'5'

Embedded

3'3'

Both with intron

342 (61%)

351 (35%)

417 (78%)

259 (45%)

394 (49%)

390 (78%)

Intron-intronless

206 (36%)

645 (64%)

103 (19%)

285 (49%)

398 (50%)

96 (19%)

Both intronless

18 (3%)

14 (1%)

13 (3%)

33 (6%)

8 (1%)

16 (3%)

Total

566

1,010

533

577

800

502

5'5', head-head orientation; 3'3', tail-tail orientation.

Galante et al. Genome Biology 2007 8:R40   doi:10.1186/gb-2007-8-3-r40