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Quantitative analysis of metabolite levels identified by targeted LC-MS/MS in corneal cell lysates isolated from healthy controls (HCFs) and keratoconus patients (HKCs), revealing the effects of CXL on glutathione metabolism. a Glutathione, b glutathione disulfide, c ascorbic acid, d NADPH, and e NADP+. n = 4, *p < 0.05, **p < 0.01, ****p < 0.0001
