Genasense blocks a gene called BCL-2, which produces a protein that prevents cells from self-destructing through a process called apoptosis.

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The scientists say they have found a way of interrupting the chemical sequence of events which leads to apoptosis of oocytes.

BBC: Fertility hope for cancer women

Natural killer cells normally play an important role in inducing apoptosis of cancerous cells and others that have been infected with viruses.

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Many chemotherapy treatments, and radiotherapy aimed at the pelvis, have the side-effect of accelerating this apoptosis, often propelling younger patients into premature menopause.

BBC: Fertility hope for cancer women