Scientists are about to grow human tissue from embryo cells, a spectacular advance with huge medical potential but raising many ethical questions. These cells are growing forever in the lab and are now being used to develop different human tissues for medical treatments, implantation, transplant etc.
Some people are worried about dismembering a small embryonic ball of cells.
They may prefer a new technique which inserts a human nucleus into an egg from a cow. The first human clone has been made already by this method, and would be almost three years old by now, except that it was destroyed at 32 cell stage. However all this will look very last century soon following news that scientists have made liver cells from stem cells found in the bone marrow of an afult.