Gleaning stem cells from cloned monkey embryos, as a team of Oregon researchers has done, is an impressive step. But it probably won't lead to medical treatments anytime soon. One hurdle is ethical ...

Early human development is a complex, multistep process that’s even more complicated to study in the lab. Models made from stem cells avoid some of the trouble with using real human embryos. In June, ...

A 25-day-old monkey embryo stained with fluorescent dye for visibility. Credit: Zhai et al/Cell/DOI 10.1016/j.cell.2023.04.019 Scientists have successfully nurtured lab-grown monkey embryos for 25 ...

NEW YORK -- Scientists in Oregon say they've reached the long-sought goal of cloning monkey embryos and extracting stem cells from them, a potentially major step toward doing the same thing in people.

Researchers have produced two monkeys with a procedure similar to that used to clone a sheep in Scotland, a development expected to help research into AIDS, alcoholism, depression and other illnesses.

The majority of fertilized eggs die and are resorbed into the body. ZEISS Microscopy/Flickr, CC BY-SA As an evolutionary biologist whose career has focused on how embryos develop in a wide variety of ...

Our ancient past isn't always buried history. When it comes to our DNA, nearly 9% of the human genome is made up of leftover genetic material from ancient viruses (called endogenous retroviruses or ...

Only about one out of three conceptions leads to birth. 1 Approximately a third of embryos fail to attach to the uterus, while another third is lost after the embryo implants. “Human reproduction is ...

At first glance, it looks like the start of a human pregnancy: A ball-shaped embryo presses gently into the receptive lining ...