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K-means cluster analysis supplemented with GO browser results.
| Cluster | No of Genes | Average Radius | Status in pterygium | Major function by GO |
| 1 | 58 | 2.463 | Down-regulated | Response to stimulus |
| 2 | 13 | 1.803 | Up-regulated | Metabolism |
| 3 | 37 | 1.507 | Up-regulated | Cell adhesion, response to wounding |
| 4 | 22 | 2.357 | Up-regulated | Lipid related |
| 5 | 26 | 1.827 | Down-regulated | Cell proliferation |
