According to BBC US scientists have produced embryos that are clones of two men, in an attempt to produce patient-specific stem cells. Researchers removed DNA from donated human eggs, and replaced it with DNA from the skin cells of two volunteers.
They produced embryos with genetic material that matched the men’s, but did not go on to extract stem cells. UK experts say the research, published in the journal Stem Cells, is a small but not a great step forward.
