Researchers at the Karolinska Institutet in Sweden have now made a breakthrough in understanding how fertilization ... multiple sperm cells fuse with a single egg and can make it unviable.

This is a fertilized human egg, prior to division. Two nuclei (one from the egg and one from the sperm) can be seen in the center. Disclaimer: AAAS and EurekAlert! are not responsible for the ...

Scientists are making strides toward growing human eggs and sperm in the lab. Groundbreaking technology, known as in vitro ...

Two weeks after a human egg is fertilized, primordial germ cells (PGCs), which develop into sperm and eggs, are formed. In six to 10 weeks after fertilization, PGCs differentiate into pro ...

It’s a new way to create “bi-paternal” mice that can survive to adulthood—but human applications are still a long way off.

As a result of my nuclear transfer experiments, speculation arose about the possibility of making human clones ... by eggs after fertilization, and hence eventually achieve cell replacement ...

The UK's fertility watchdog, the Human Fertilisation and Embryology Authority (HFEA), has revealed that the technology for ...

But when conception takes place outside the body ... You'll be given medication for this part. (Fun fact: Human egg cells are gigantic compared to the other cells in our body.) ...

A groundbreaking fertility development, "holy grail" research, may allow for single-parent conception using lab-grown eggs ...

It could one day enable medical workers to make more objective assessments on human egg quality ... that can produce 3-D images of fertilized eggs’ cell nuclei. The nuclei are colored to ...

Donald Trump, who has returned to the U.S. presidency, has declared that there are only two genders, male and female, and ...