IT will be a glad day for the science of embryology when all the details of the sequence of the development of man are described from successive stages of the human ovum and embryo. The chick has ...

In 1827, with the discovery of the human ovum, the mistaken biology of Aristotle was discredited. Scientists increasingly understood that the union of sperm and egg at conception produces a new ...

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 ...

"This is really a textbook image of a human day-14 embryo," Prof Hanna says, which "hasn't been done before". Instead of a sperm and egg, the starting material was naive stem cells which were ...

A person shall not purchase or offer to purchase a human egg or sperm for human somatic cell nuclear transfer or for any purpose other than treating human infertility or for clinical investigation ...

This allows an embryo created by fertilising a human egg to be grown for 14 days. However, these "embryo models" are not legally "embryos" and are not governed by the same laws. Dr Ildem Akerman ...

Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.