The National Institutes of Health has issued a moratorium on funding work that puts human stem cells into nonhuman embryos. The concern is that... Should Human Stem Cells Be Used To Make Partly Human ...

The guidelines do not call for a complete ban on human embryonic stem cell research resulting in chimeras. Rather, they allow for the creation of various chimeras contingent on review board approval.

Here’s what you’ll learn when you read this story: With more than 100,000 people in need of an organ transplant in the U.S. alone, scientists have turned toward perfecting human-animal chimeras as a ...