Fig 5.
Concentrations of hexanoyl lysine (HEL, A), 4-hydroxy-2-nonenal (4-HNE, B), malondialdehyde (MDA, C) and 8-oxo-2’-deoxyguanosine (8-OHdG, D) in the tear film. * P < 0.05 versus baseline. ** P < 0.05 versus 1 h.
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