Some newly reported clumps of cells growing in lab dishes have been hailed as the closest things to human embryos that scientists have ever made in the lab. These entities are human embryo models — ...

Scientists are exploring ways to mimic the origins of human life without two fundamental components: sperm and egg. They are coaxing clusters of stem cells – programmable cells that can transform into ...

While many hail the ruling, critics fear mutant creatures may result. Sept. 13, 2007 — -- Last week, Britain made a landmark decision that allows researchers to use animal eggs in the creation of ...