Maternal health Women's health See all topics Facebook Tweet Email Link Link Copied! Follow Scientists are exploring ways to mimic the origins of human life without two fundamental components: sperm and egg. They are coaxing clusters of stem cells – programmable cells that can transform into many different specialized cell types – to form laboratory-grown structures that resemble human embryos. These embryo models are far from perfect replicas. But as labs compete to grow the best likeness, the

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