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Effects of hyperosmotic exposure on cell viability. Stratified human corneal epithelial cells (a) and stratified human conjunctival epithelial cells (b) were exposed to 90 and 120 mM NaCl-added media for 24 h. Cell viability was determined with MTT assay and data were normalized to the control value (100%) and expressed as the mean ± standard deviation (n = 3). ** p < 0.01 vs control, *** p < 0.001 vs control
