John Timmer writing for Ars Technica discusses new NIH rules for stem cell research – specifically injecting human stem cells into embryos of another species.

(credit: California Stem Cell Agency) On Thursday, the National Institutes of Health announced that it was revising the rules that govern its funding of stem cell research. The rules focus on cases where human stem cells are introduced into embryonic animals, creating an embryo that’s a mixture of human and animal tissues. While the rules…

via US alters rules for funding for animals with human stem cells — Ars Technica