Pino Sweet Repose painting

Pino Sweet Repose painting
Johannes Vermeer The Kitchen Maid painting
While the results of cloning remain mysterious, the process is now well practiced. To clone an animal, scientists insert a cell from an adult into an egg with its genetic material removed. The egg then reprograms the adult cell to develop into an embryo and, eventually, a genetic identical to the owner of the inserted cell. Tests have shown that inserting embryonic stem cells (which have only been isolated in mice and people) rather than any adult cell, leads to a 10 percent to 20 percent improved cloning rate in mice. Scientists think this may be because it's easier for emptied eggs to reprogram stem cells to develop into embryos.Researchers have suspected that the process of reprogramming a cell in the emptied egg leads to flaws in clones. But this new research shows, the stem cells, themselves, may be flawed.