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List of terms beginning with Ap

Apoptosis

(Also called 'cell suicide' or 'programmed cell death'). Normal cells automatically kill themselves by apoptosis once they have reproduced about 60 times. This helps prevent cancer, by killing off older cells that have accumulated more damage to their DNA. Cancer cells have usually developed the ability to bypass apoptosis, and can carry on dividing.

Appendix

The tube shaped sac opening into the lower end of the large intestine. It is small and has no known function.