Fig. 6

a lncRNAs found in each of the four species in test runs of lncEvo; b class codes of lncRNA transcripts identified according to Cuffcompare in comparison to those identified based on the reference ENSEMBL annotations; “=”: complete match with the intron chain; “j”: potential novel isoform; “i”: transcript falls entirely within a reference intron; “o”: generic exonic overlap with a reference transcript; “u”: unknown intergenic transcript; “x”: exonic overlap with a reference transcript on the opposite strand. The distributions reflect the quality of the ENSEMBL annotations, but the volume of the sequencing data and the types of samples used also have an impact on the distributions (some tissues possess a much more diverse repertoire of lncRNAs than other tissues)