Almost half of Spanish couples recently asked to donate their excess embryos to stem cell research did so.
The response of 97 couples who had undergone in vitro fertilization treatment at two Spanish clinics contrasts sharply to the situation in the United States, where a 2003 review found that just 3 percent of surplus embryos were going to stem cell research.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.