Media reports generally mention only two ways to produce human embryonic stem cells. Both techniques—the first using spare embryos from fertility clinics, the second involving cloning—are ...

In this slide show showing somatic cell nuclear transfer, as it's also known, we explain how we clone egg cells to create ... and the other from human (right). Both mouse and human ESCs form ...

In a potential breakthrough for infertility and genetic disease treatments, scientists at Kyoto University have succeeded in mass-generating precursors to sperm and eggs from human iPS cells.

A next goal of the research group is to understand the role of Plk1 in the specialized division of egg cells, called meiosis. Human egg cells, for example, spend decades in the prophase state.