DATA LIMITATIONS. “The available dataset allowed only for the investigation of 189 orthologous clusters, equivalent to ~1% of the A. thaliana genome. Since orthologous clusters include only ESTs from both seagrasses, the presented dataset is not an unbiased sample of the genome and is probably enriched for genes that show significant expression levels in both seagrass species.” (ESTs = expressed sequence tags).
http://bmcevolbiol.biomedcentral.com/articles/10.1186/1471-2148-11-8