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Lens fibers have a fully functional ubiquitin-proteasome pathway

We previously showed that lens epithelial cells have a fully functional ubiquitin-proteasome pathway (UPP) and that ubiquitin-conjugating activity is up-regulated in response to oxidative stress. In this study we assessed the protein levels and activities of different components of the UPP in lens fibers. Calf lenses were dissected into four different regions: epithelial layer, outer cortex, inner cortex and nu...