The researchers have devised a way of growing human eggs in a laboratory. It could lead to immature eggs being stored and subsequently developed, fertilised and implanted into the womb. As well as preserving the fertility of females undergoing chemotherapy, the technique could increase the number of eggs available for stem cell research. Young women who are diagnosed with cancer can be left infertile by chemotherapy. Currently, doctors remove a piece of their ovaries and implant it later in life, but this runs a risk of reintroducing the cancer-causing cells into the patient.

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