The scientific breakthrough, announced on this day in 1997, proved that geneticists could clone an adult mammal, giving rise to a new era of ethical debate and experimentation ...

Many animal embryos are able to undergo diapause, a period of arrested development, before implanting in the uterus, but though only 2% of mammals were known to have this ability, reported Nature. Now ...

Scientists have found a way to study early embryonic development without real embryos. Using CRISPR, they programmed stem cells to self-organize into structures mimicking early embryos. The cells show ...

In May 2008 a cross-party attempt to ban hybrid human animal embryos was defeated on a free vote in the House of Commons, by 336 to 176. MPs had been debating the Human Fertilisation and ...

Human embryos briefly exhibit traits like tails and gill-like structures, revealing our evolutionary history and deep ...

Oxytocin, a hormone linked to bonding behaviors, might also help mice modulate their pregnancies. Someday, this line of ...

They have successfully grown human stem cells in a pig embryo. Why would anyone do this? Turns out, many scientists have been working on growing the organs of one animal inside of a different type ...

Andres Gambini, who led the research into the kangaroo embryo, said the technique could be applied to other animals under the threat of extinction. “Our ultimate goal is to support the ...

Placenta is not unique to mammals. Certain fish and reptiles have placenta-like connections allowing diffusion of materials between vascularized oviduct and embryo. Mammalian placenta is much more ...

If a human–animal cybrid embryo were genotyped based solely on its mtDNA content, then genetically it would be deemed animal, especially if it were homoplasmic with only recipient oocyte mtDNA.

Cytoplasmic flows guide chromosome positioning during embryogenesis. During the first stages of animal embryo development, the egg cell undergoes multiple divisions without growin ...