Of the 48 genes whose expression was enriched in both mesothelial sources seven were previously associated with the mesothelial lineage or mesothelioma (Aldh1a2 [31], Crip1 [32], Has1 [33], Prrx2 [34], Upk3b [35], Wnt2b [36], and Wt1 [37]). The gene discussed is HAS1; the disease is mesothelioma.