The writer is a science commentatorEgg plus sperm equals embryo. It is hard to think of a more basic rule in biology. Still, rethink it we must. Last week, at a stem cell conference in Massachusetts, researchers revealed they had created “synthetic” human embryos using neither eggs nor sperm. These structures, more correctly called embryo models, were instead grown from single living stem cells, which were derived from a real human embryo. It was not a one-off achievement: another team created an embryo model with a heartbeat.
本文作者是科學評論員
您已閱讀9%（542字），剩余91%（5658字）包含更多重要信息，訂閱以繼續探索完整內容，并享受更多專屬服務。