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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 amino acids, and collagen intermediates. a Cysteine, b tyrosine, c lysine, d proline, e myo-inositol, and f histidine. n = 4, *p < 0.05, **p < 0.01, ***p < 0.001
