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L-histidine enhances the barrier function of organotypic skin model as indicated by penetration of Lucifer Yellow fluorescent dye. (A) A representative image of organotypic skin model with Lucifer Yellow dye seen under fluorescence and H&E staining. (B) Skin models grown in 5 mM L-histidine had reduced dye penetration (N=5; P<0.01), whereas L-lysine and L-serine had no effect on barrier function.
Note: **p<0.01, n=5.
Abbreviation: H&E, hematoxylin and eosin.
