Women could receive transplant organs grown from stem cells from one of their donated eggs, according to a study in the journal Science today. A new technique overcomes a major barrier to transplants by tailoring the tissues to a patient's immune system, removing the risk of rejection. Researchers at Harvard Medical School and Children's Hospital, Boston, generated organs compatible with the immune system from mouse egg stem cells. The cells were injected into mice, where they grew into a variety of new tissues. The team is now trying to repeat the process using human eggs.