We all start our lives as symmetric balls of cells. In humans, during the first few weeks after fertilization, embryonic ...

an extra-embryonic cell layer that produces the nutrient-providing yolk sac and the embryonic layer that will give rise to the embryo itself and the amniotic sac that protects the developing embryo.

A stem-cell derived human embryo model showing blue cells (embryo), yellow cells (yolk sac) and pink cells (placenta). Scientists have grown an entity that closely resembles an early human embryo ...

In utero, the blastocyst implants and all three embryonic germ layers are formed during gastrulation. Somatic stem cells are present in many fetal and post-natal tissues. Somatic stem cells are ...

has analyzed in detail how these patterns form in the embryo using 3D imaging techniques and computer simulations. The researchers discovered that differential growth of the skin tissue layers ...

Mature egg cells, or oocytes, are essential for fertilization in assisted reproductive technologies. However, some 'denuded' ...