MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Cloning research. Researcher transferring oocyte cells into a tube containing maturation medium. Oocytes are collected from the ovaries of domestic cows (Bos taurus) for use in bovine cloning. Once an oocyte has matured, its nuclear material is removed and replaced with nuclear material from a body (somatic) cell of a donor animal. The resulting cloned oocyte is cultured to the blastocyst embryo stage before being implanted into a foster cow for pregnancy. Clones of valuable domestic cows and the gaur (Bos frontalis), an endangered species related to the cow, have been created by this method.
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