Scientists at a technology company said Sunday they have created human embryos through cloning, drawing criticism from President Bush and lawmakers and raising new ethical questions. Advanced Cell ...

7,8 (5) Gastruloids: To overcome limitations in studying embryonic development after 14 days, one group pre-treated ESCs with an activator of a proliferation pathway and then cultured the cells at a ...

Learn about our Editorial Policies. It is allowing people to do biochemistry with mammalian embryos that they couldn’t do otherwise. After a sperm fertilizes an egg, the totipotent cell divides into a ...

Now - the clever bit. The cells on the inside layer of this very early embryo can make all of the cell types needed in your body. They're called stem cells. The stem cells continue to divide by ...