Table 2.

Summary of genes, splice junctions, and previously unrecognized TUs identified by RNA-Seq; features associated to the 352 previously unknown intergenic TUs identified in HEK and B cells.

FeaturesNumber of TUs
CAGE tags 253
CAGE tags + PolIIa-bound regions 22
PolIIa-bound regions (without CAGE) 2
Contain repeated elements 50
Match to human pseudogenes 9
Identity to human full-length cDNA 28
Similarity to nonhuman sequences 16
Similarity to known proteins 121
Exon-intron structure 24
Uniquely expressed in HEK293 134
Uniquely expressed in B cells 153
Expressed in both cell types 66