Synthetic mouse embryo created. With a beating heart

It has a beating heart, a brain (or at least the structures present in the early stages of its development), and even the yolk sac where embryos grow in the first few weeks of pregnancy. But it is not an embryo like the others: it does not have a mother or a father, at least in the conventional sense, because it was created from mouse stem cells in the laboratories of Calthec.