Human eggs use chemical signals to attract sperm. New research from Stockholm University, Manchester University NHS Foundation Trust and The University of Manchester shows that eggs use these chemical ...

The little clump of cells looked almost like a human embryo. Created from stem cells, without eggs, sperm, or a womb ... stem cells to mimic the structure and function of a real, growing embryo.

Instead of a sperm and egg, the starting material ... achieved a faithful construction of the complete structure [of a human embryo] from stem cells" in the lab, "thus opening the door for studies ...

This definitive and essential source of reference has been thoroughly up-dated and revised to meet the requirements of all laboratories involved in the analysis of human semen. The book sets out the ...