Fig. 1

Identification of lncRNAs. a Computational pipeline used to identify lncRNAs. b Total number of lncRNAs identified per species. c The percentage of lncRNAs that match previously annotated lncRNAs in the NCBI annotation, are novel isoforms of previously annotated lncRNAs, or are expressed from unannotated genomic loci. A lncRNA was considered a novel isoform if it shared some exons with an annotated gene, but had additional unannotated exons or novel splicing. Previously annotated lncRNA had the same exons and splicing as an annotated gene. LncRNAs expressed from novel loci were in regions of the genome that no annotated transcript originated. d Distribution of transcript lengths of both lncRNAs and annotated protein-coding genes. e Distribution of the number of exons of both lncRNAs and protein-coding genes. f Distribution of the number of isoforms of both lncRNAs and protein-coding genes