It has to do with a false assumption ... Here's a good article from the Mayo Clinic: http://www.mayoclinic.org/tests-procedures/stem-cell-transplant/in-depth/stem-cells/ART-20048117
Because the reason we use stem cells is for human applications, and the vast majority of animal cells just plain wouldn't work?
Embryos used for stem cell research are only "controversial" to those ignorant of how it works. These are embryos that already exist and would otherwise be discarded- it's not like you're "saving" anything if … Read more