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The O’Sullivan lab at UPMC Hillman Cancer Center conducts research into proteins that alter the structural and epigenetic functions of human telomeres. Telomeres are structures at the ends of chromosomes – the integrity of telomeres is an important factor in maintaining genome stability to prevent cancer and accelerated aging. Current efforts in the lab relate to: (i) deciphering the relationship between the regulation between chromatin structure and telomere function and (ii) new aspects of ADP-ribosylation in genome stability.