Supplementary Table S5 also compares expression of genes listed in the ERBB SuperPath of GeneCards Suite. Some of these genes were downregulated in pterygium, but genes encoding the extracellular ligands were upregulated. HBEGF, AREG, and AREGB were upregulated greater than 3-fold in pterygium-NE, while HBEGF was upregulated greater than 3-fold in pterygium-E. Here, AREG is linked to pterygium.