Containing a chromosomal complement from a mother and father and the mitochondrial DNA from the egg of a donor:three-parent embryos...
Now work on the process, called human nuclear transfer, has been called off after the authorities realised how close scientists were to achieving the birth of a three-parent child.
Is it squeamishness or superstition that makes the announcement from Newcastle University of plans to create a ‘three-parent’ embryo controversial?