The source of stem cells points to two proteins

Mammalian embryos are unlike those of any other organism as they must grow within the mother's body. While other animal embryos grow outside the mother, their embryonic cells can get right to work accepting assignments, such ...

Scientists mimic the earliest stages of human development

Human embryos start as a tiny mass of cells that are all the same. The first step in growing from a homogenous ball of cells into a complex individual with distinct organs and tissues is for the cells to divide into distinct ...

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