Table 1. Number of unknown transcripts that pass the filtering pipeline, showing no coding potential.

	Unknown transcripts with no coding potential	Filtered for moderate to high expression	Transcripts conserved with human lncRNA	Transcripts conserved with mouse lncRNA	Transcripts conserved with both human and mouse lncRNA
Class 1—Pass only one of the filters	24,381	9,828	396	115	53
Class 2—Pass at least 2 of the filters	20,301	10,467	645	186	57
Class 3 –Pass all 3 filters	16,336	9,778	289	119	36