LncRNAs mammal conservation. The heatmap recapitulates the screening result of the new discovered 2047 pig lncRNAs versus eighteen mammal genomes. The columns represent the mammal genomes while the rows indicate the query lncRNAs. The spots indicate the result of the search of each pig lncRNA versus the different genomes. Green spots represent hits having high similarity scores. Black spots indicate low similarity scores. Red spots indicate that no homolog was detected.