Meaning of PROGRAMMED CELL DEATH

WordNet Dictionary
	Definition:		[n]  a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival
	Websites:
	Synonyms:		apoptosis, caspase-mediated cell death
	See Also:		cell death, necrobiosis
Biology Dictionary
	Definition:		Programed cell death as signalled by the nuclei in normally functioning human and animal cells when age or state of cell health and condition dictates. Cancerous cells, however, are unable to experience the normal cell transduction or apoptosis-driven natural cell death process.