Scientists turn stem cells into precursors for sperm, eggs

Human embryonic stem cells derived from excess IVF embryos may help scientists unlock the mysteries of infertility for other couples struggling to conceive, according to new research from the Stanford University School of Medicine. Researchers at the school have devised a way to efficiently coax the cells to become human germ cells - the precursors of egg and sperm cells - in the laboratory. Unlike previous research, which yielded primarily immature germ cells, the cells in this most-recent study functioned well enough to generate sperm cells.

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