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Staining intensity for α2-macroglobulin in corneal epithelial cells, keratocytes, and stromal extracellular matrix (ECM) in the lenticules, host stromas, and normal human and keratoconus corneas as scored by three masked observers. The scores were analysed by Mann-Whitney U tests. *p<0.01 compared with normal human specimens; †p<0.05.
