Gleaning stem cells from cloned monkey embryos, as a team of Oregon researchers has done, is an impressive step. But it probably won't lead to medical treatments anytime soon. One hurdle is ethical ...

Meet Zhong Zhong and Hua Hua, two cloned macaque monkeys. Chinese scientists first unveiled these monkeys several weeks ago, marking the first time primates have been successfully cloned with the same ...

In the earliest hours after fertilization, an embryo takes its first steps toward becoming a living organism by shedding maternal control and activating its own genetic program. This critical process, ...