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Enhancement of DNA repair and prevention of surface receptor aggregation most effectively block UVB-induced apoptosis. HeLa cells were UVB exposed at 37°C (open bars) or at 4°C (filled bars). Subsequently, cells were treated with Photosomes or liposomes followed by PRL, and 16 hr later, apoptosis was evaluated by using a cell death ELISA. Enrichment factor was used as a parameter of apoptosis and is given as the mean ± SD of three independently performed experiments.
