Living organisms experience various stresses during their lifespans. These stresses include radiation, ultraviolet rays, and chemical substances which directly damage DNA and cause cancer. Organisms are able to speedily repair DNA when it is damaged, however, when the damage is severe they manifest two different cell responses.  These are apoptosis, a type of controlled cell death, and cellular senescence, which permanently suspends cell growth.  It … Continue reading Study identifies genes which control cellular senescence.