Stem cell, which means they don't have to use in theory, one might not have to use in theory, one might not have to use in theory, one might not have to use embryos that are left over from have to use embryos that are left overfrom idf have to use embryos that are left over from idf treatments donated by their parents or specifically for research. 50 their parents or specifically for research. , ., ., �* their parents or specifically for research. ., �* ., ., research. so you wouldn't have to use those ibf _ research. so you wouldn't have to use those ibf generated - research. so you would...