Table 2.

Estimate number of human ncRNAs from various sources.

Source	Number of types	Percent of human genome	Estimated average size (kb)	Reference
Mammalian lincRNome	53647	2.3	1.4	Managadze et al. (2013)
LNCipedia (as of March 2014)*	21487	0.67	1	Volders et al. (2013)
FPKM > 1 lincRNAs	35585	1.1**	NA	Hangauer et al. (2013)
Gencode v7 catalog of human ncRNAs	9277	0.29**	Median of 0.6***	Derrien et al. (2012)
LncRNAs – Gencode v21 (as of 2014 November)	15877	0.50**	NA	http://www.gencodegenes.org/stats.html
Jia et al. (2010)	5446	0.17**	NA	Jia et al. (2010)
Cabili – low confidence	8195	0.26	1	Cabili et al. (2011)
Cabili – high confidence	4273	0.26	1	Cabili et al. (2011)
Small ncRNAs – Gencode v21 (as of 2014 November)****	9534	0.045	0.15	http://www.gencodegenes.org/stats.html
eRNAs	43011	0.34	0.25	Andersson et al. (2014)

*Splice variants were excluded.

**Assumes an average length of 1 kb.

***Median size of 592 nucleotides but with a significant fraction at higher sizes.

****Contains snRNAs, snoRNAs, rRNAs, mitochondrial tRNAs and rRNAs, miRNAs, and “miscellaneous RNAs.”