Researchers in the U.S. created monkey embryos asexually, without the use of sperm, in order to harvest stem cells from them. The company behind the research, Advanced Cell Technology, says the ...

For the first time, a stem cell model has produced a structure resembling an early human embryo with a yolk-sac-like structure, from a single starting stem cell population and without direct genetic ...

Researchers have produced two monkeys with a procedure similar to that used to clone a sheep in Scotland, a development expected to help research into AIDS, alcoholism, depression and other illnesses.