That technique for generating embryonic-like stem cells (called induced pluripotent stem cells, or iPS cells) bypassed the need for transferring the cells into eggs, as Wilmut had done, and also averted the ethical issues attached to extracting stem cells from embryos as Thomson had done.

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Scientists at Stanford University School of Medicine have discovered that the millions of fat cells removed during liposuction can be easily and quickly turned into induced pluripotent stem cells, or iPS cells, more easily than the skin cells that researchers used when the first iPS cells were created in 2007.

CNN: Study: Human fat yields multipurpose stem cells

While cloning stem cells is a technical breakthrough, there's already a method of deriving embryonic-like stem cells that doesn't require the use of embryos at all: induced pluripotent stem (IPS) cells, said Dr. George Daley, who is director of the Stem Cell Transplantation Program at Children's Hospital Boston and an international expert in stem cells.

CNN: Cloning stem cells: What does it mean?

Since that time, more advanced cloning technologies have evolved, including the iPS system of induced pluripotent stem cells, which can be grown from nearly any skin cell.

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