(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 ...

Cloning promises genetic copies, but a growing body of research across dogs, mice, cattle, and primates shows that clones ...

But we have also learned something else: Over one-third of the House of Representatives believes that corporations and researchers—like Advanced Cell Technology in Worcester, Massachusetts, which has ...

March 24 (Reuters) - Revealing the limitations of cloning, researchers who repeatedly cloned mice for two decades have ...

Scientists say they’ll go ahead anyway. Lawmakers, seeking to rein in the scientific appetite for human experimentation, are attempting to ban human cloning. On July 31, the House approved a bill, 265 ...

Researchers in Oregon claim to have solved the tricky problem of cloning human stem cells, but you're more likely to see a duplicate of a years-old ethics debate than you are a duplicate human. This ...

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 ...

Stanford University announced yesterday it would create an institute to develop medical therapies from human embryonic stem cells, the promising but controversy-laden cells found inside human embryos.

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 ...

A Feb. 9 article incorrectly referred to Richard Doerflinger of the U.S. Conference of Catholic Bishops as the organization's director of abortion-opposition activities. Doerflinger's title is deputy ...