Why humans have a philtrum, the groove above your lip, explained by an evolutionary biologist — from embryonic face-building to vestigial anatomy.

Two separate research teams used base editing to make single-nucleotide changes in human embryos this month, targeting genes tied to cholesterol regulation, blood disorders, and early development. One ...

University of Cambridge scientists have used human stem cells to create three-dimensional embryo-like structures that replicate certain aspects of very early human development—including the production ...

Researchers at the Francis Crick Institute have developed a new stem cell model of the mature human amniotic sac, which replicates development of the tissues supporting the embryo from two to four ...

An international team of scientists led from Sweden's Karolinska Institutet has for the first time mapped all the genes that are activated in the first few days of a fertilized human egg. The study, ...

In the earliest hours after fertilization, an embryo takes its first steps toward becoming a living organism by shedding maternal control and activating its own genetic program. This critical process, ...

The discovery of a gene essential to early embryonic development sheds light on the preliminary stages of human placenta formation. A team led by scientists from the University of California San Diego ...

About 9% of men of reproductive age in the United States experience fertility problems. One of the many causes of male ...