From: Computational discovery of sense-antisense transcription in the human and mouse genomes
(a) | Genomic arrangement | Number of pairs | |||
 | Tail to tail (3' to 3') | 134 | |||
 | Head to head (5' to 5') | 12 | |||
 | Transcript starts in intron of the other transcript | 3 | |||
 | Transcript contained entirely within the other transcript | 39 | |||
 | Difficult to classify | 29 | |||
(b) | Candidate pairs | S/H | S/NH | NS/H | NS/NH |
 | S/H | 92 | 24 | 18 | 65 |
 | S/NH | - | 0 | 3 | 2 |
 | NS/H | - | - | 1 | 8 |
 | NS/NH | - | - | - | 4 |