Cell death is the event of a biological cell ceasing to carry out its
functions. This may be the result of the natural process of old cells dying
and being replaced by new ones, as in programmed cell death, or may result
from factors such as diseases, localized injury, or the death of the organism
of which the cells are part. Apoptosis or Type I cell-death, and autophagy or
Type II cell-death are both forms of programmed cell death, while necrosis is
a non-physiological process that occurs as a result of infection or injury.
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