Central to many of the bioethical issues of our time is the question, When should society confer moral status on an embryo? When should we call an embryo or a fetus one of us? The fertilized egg ...

A gene that turns on very early in embryonic development could be key to the formation of the placenta, which provides the ...

(RNS) — Scientists have created a human embryo without the use of sperm or an egg — a true test-tube baby. Such embryos cannot (yet) develop into full-grown human beings. Even if transplanted into a ...

A new study examining mouse embryos when they are composed of just two cells, right after undergoing their very first ...

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 ...

They see a microscopic flash at fertilization, a burst of fluorescence that marks a sudden release of zinc from the human egg ...

Zoe Strozewski is a Newsweek reporter based in New Jersey. Her focus is reporting on U.S. and global politics. Zoe joined Newsweek in 2021. She is a graduate of Kean University. You can get in touch ...

Cambridge University researchers developed the world’s first synthetic human embryo models using stem cells but without using an egg or sperm, which has sparked ethical concerns and questions about ...

Scientists have discovered that they can generate induced blastoids, or iBlastoids, that emulate natural human blastoids. Because iBlastoids are built of reprogrammed skin cells, they represent ...

A fertility clinic in Australia has confirmed a critical error in which one woman gave birth to another couple’s child after an embryo transfer went wrong. The ...