MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Cloning research. Researcher using a pipette to fill a multi-well sample tray with liquid medium for the maturation of sheep oocyte cells. Oocytes are collected from domestic sheep (Ovis aries) ovaries for use in cloning a rare type of wild sheep called a mouflon (Ovis orientalis musimon). During cloning, nuclear material is removed from matured sheep oocytes and is replaced with that from mouflon body (somatic) cells. The resulting cloned oocyte is cultured to the blastocyst embryo stage before being implanted into a foster sheep for pregnancy. The first cloned mouflon was born by this method in October 2000 at the University of Teramo in Italy.
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