Human bodies have to be built from a single egg cell that's fertilized by a sperm cell. Many rounds of cell division occur as the body is developing, and it seems that there are plenty of chances for ...

The majority of fertilized eggs die and are resorbed into the body. ZEISS Microscopy/Flickr, CC BY-SA As an evolutionary biologist whose career has focused on how embryos develop in a wide variety of ...

SAN FRANCISCO -- A cellular signaling system that responds to THC, the active substance in marijuana, as well as to anandamide, a cannabinoid-like molecule normally produced in the body, may regulate ...

Despite significant biomedical advances in recent decades, the very earliest events of human development¬--those that occur during a critical window just after fertilization--have remained an ...

Multiple genetic changes can occur before or early after conception, a new study describes. The researchers looked at a type of genetic change called copy number variants, which refers to the number ...

When couples experience infertility, medical science presents possible solutions for a potentially successful conception of a baby. Infertility issues can be addressed with Human Chorionic ...

For the first time, a study shows that female eggs may not necessarily be required to create offspring; scientists from the University of Bath in the United Kingdom have developed a technique that ...