Another microarray study compared human whole pterygium and autologous conjunctiva and found increased levels of extracellular-matrix-related, proinflammatory, angiogenic, fibrogenic, and oncogenic transcripts, including MMPs, fibronectin, macrophage inflammatory protein 4 (MIP-4), and lipocalin 2 in pterygium [10]. The gene discussed is CCL18; the disease is pterygium.