Artificial mouse cells grown from outside body within a blob of gel shown to morph into primitive embryos, roughly equivalent to one third of way through pregnancy

The transformation of a fertilised egg cell into a tiny living embryo ranks among nature’ ersus most impressive feats. Now scientists have replicated this particular critical step towards a new life for the first time, growing a good artificial mouse embryo from stem cells in the laboratory.

The cells, grown outside the body in a blob of gel, were shown to morph into primitive embryos that perfectly replicated the internal structures that emerge throughout normal development in the womb.

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