Stem-cell research lab in the Czech Republic (file photo)
February 1997 -- Scotland's Roslin Institute announces it has cloned a sheep from cells taken from an adult ewe. The sheep, Dolly, was the first animal ever cloned using such a process. Previous cloning had involved creating an animal from undeveloped fetal cells in a surrogate mother.
-- The U.S.-based cattle-breeding company ABS announces it has cloned a calf from stem cells removed from a cow fetus.July 1998
-- The University of Hawaii announces the successful cloning of dozens of mice.August 2000
-- U.S.-based biotech firm BioTransplant Inc. and Massachusetts General Hospital announce the cloning of a line of miniature pigs, to be used to grow organs for human transplants.February 2002
-- Researchers at Texas A&M University announce they successfully cloned a domestic cat in late 2001. The cat, whose birth was later confirmed, was named "cc:".March 2002
-- French scientists announce the first clones of rabbits from adult cells.May 2003
-- Scientists in Idaho announce they have cloned a mule, a sterile hybrid normally produced by breeding a donkey and a horse. There have been several other projects in the area of equine cloning.February 2004
-- South Korean researchers clone human embryos and extract their stem cells.August 2005
-- South Korean scientists say they've cloned the first dog, an Afghan hound named Snuppy.
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