Researchers study how oxygen around an embryo helps shape the way feet and digits form in amphibians and chickens.

Gulf killifish have made a stunning comeback in Houston with the help of genetic mutations imported from interspecies mating with Atlantic killifish.

Rhesus monkeys engineered to express a human gene reportedly show delayed brain development and better short-term memory. Fellow scientists are raising ethical red flags.

One of the foremost molecular biologists of the 20th century, the Nobel laureate established C. elegans as a model organism, mapping its genes and development.

Many researchers see the move to relax the rules as a welcome change, yet some are worried the revisions don’t take public concerns enough into consideration.

Similarities in gene expression hint at the origin of a certain type of pancreatic tumor that predominantly afflicts women.

A gene helps motor neurons successfully venture out from the spinal cord to muscles during mouse development.

A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.

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