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Massachusetts-based Advanced Cell Technology has been working with a method sometimes used to test embryos for severe genetic diseases. Called preimplantation genetic diagnosis, it involves taking a single cell from an embryo when it contains only eight or so cells.
Dr. Robert Lanza, ACT's scientific director, said it provides a way to create mass quantities of embryonic stem cells without harming a human embryo. Current stem cell technologies require the embryo's destruction.