Bidirectional promoters are the major source of gene activation-associated non-coding RNAs in mammals

BMC Genomics

Table 1 The percentage of transcribed regions in the whole genome

	Transcribed regions	Unidirectionally transcribed regions^a	Bidirectionally transcribed regions^b
Cerebral cortex	25.0%	24.3%	0.7%
Cerebellum	30.0%	28.7%	1.3%
Heart	21.6%	20.9%	0.7%

^aRegions where either sense or antisense transcripts (but not both) originated.
^bRegions where both sense and antisense transcripts originated.

ISSN: 1471-2164