The embryos completed one-third of their total gestation outside of a uterus.

DNA replication errors during cell division cause monozygotic twins to diverge from each other even during the earliest stages of development, a new study finds.

Extended pluripotent stem cells from mice can self-organize to form blastocyst-like structures called blastoids that enable a closer look at early mammalian development.

To study the fate of stem cells in developing chick embryos, researchers trace their steps over time.

The bipaternal pups died soon after birth, but mice with two mothers grew into fertile adults.

The winner of the 2018 Nikon Small World in Motion video competition shows the development of sensory neurons in a zebrafish embryo.

Methylation patterns at so-called metastable epialleles in the genome stamp a memory into each of our cells.

The finding confirms that a cluster of cells that directs the fate of other cells in the developing embryo is evolutionarily conserved across the animal kingdom.

New technologies reveal the dynamic changes in mouse and human embryos during the first week after fertilization.