Natural Cell Death :
Necrosis : The death of most or all of the cells in an organ or tissue due to disease, injury,
or failure of the blood supply.
http://en.wikipedia.org/wiki/Necrosis#Classification
Detailed studies in this simple model organism demonstrated that 131 of totally 1090
cells die reproducibly during development, and that this natural cell death
www.biologyjunction.com/cell_death.htm
Thanatosis : apparent death, adaptation
