The extremely rare event, thought to be caused by two sperm cells fertilizing the same egg simultaneously, was last reported in 2007.

The same network of transcription factors may be responsible for both cleft palate and neural tube defects, according to a new study connecting mouse and human data.

A compound produced by Pseudomonas aeruginosa activates signaling pathways that prevent seeds from growing in unfavorable environments.

Genetic mutations create lab mice with unusually long and short tails.

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

The Indiana University professor was known for his research on the evolution of organismal development.

A newly developed underwater ultrasound reveals a fetal shark swimming between the two uteri of its mother.

A bright blue stain highlights the sensory nerves of a developing mouse embryo.

Rodent and human studies have revealed a multitude of effects starting during gestation and lasting into adulthood.