Table 1.

Long non-coding RNA (lncRNA) genes catalogued by various annotation systems. The average number of exons and introns per transcript is given in the (avg.) column.

	Genes	Transcripts	Exons	(Avg.)	Introns	(Avg.)
Ensembl 60	1443	1703	4921	2.89	3218	1.88
Cabili 2011	8263	14,353	33,045	2.30	18,607	1.30
NONCODE 2016	160,376	233,696	536,111	2.29	305,771	1.31
GENCODE v7	9580	14,984	42,060	2.81	28,998	1.94
GENCODE v24	15,941	28,031	68,457	2.44	45,016	1.61