(CNN) -- A human embryo, containing about a couple hundred cells, is smaller than the period at the end of a sentence. Scientists need strong microscopes to see these precursors to life, and to take ...

Scientists have used cloning to create human embryonic stem cells, a step toward developing new medical treatments, but one that might also hasten the day when it will be possible to create cloned ...

The emotion, tumult and acrimony over human cloning, stem-cell research and abortion were compressed into one small meeting room Thursday in the Capitol. Dozens of people packed a hearing to testify ...

The idea of human cloning was science fiction when it was first imagined. But in the last few decades, technological and scientific advances have made this a real possibility. Although the ethics of ...

Please enable JavaScript to read this content. After more than 15 years of failures, biologists have finally created human stem cells by the same technique that ...

Human cloning has been used to produce early embryos, marking a "significant step" for medicine, say US scientists. The cloned embryos were used as a source of stem cells, which can make new heart ...

Pluripotent stem cells are known for the need to grow as colonies in order to prevent differentiation. This adds complexity to the isolation/expansion of clonal populations following research ...

An entirely appropriate stew of scientific vexation and mortification has accompanied revelations that the incredible Korean achievements in human embryonic cloning and stem cell research are exactly ...

If there is one thing that people on both sides of the cloning debate agree upon, it’s that cloning is an incredibly inefficient process. When it comes to cloning animals, like Dolly and Snuppy, the ...

VATICAN CITY (Reuters) - A Vatican bioethics document Friday condemned artificial fertilization and other techniques used by many couples and also said human cloning, "designer babies" and embryonic ...

WASHINGTON (Reuters) - New stem cell guidelines released on Friday by the U.S. National Institutes of Health would limit federal funding of the research to embryos left over at fertility clinics and ...