MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Cloning research. Pipette manipulating cloned cow embryos. The developing embryos are cultured in drops of synthetic oviduct fluid (SOF) covered in mineral oil. A cloned cow embryo is created by transferring nuclear material from a body (somatic) cell of a donor cow into an empty cow oocyte cell. 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. Clones of other animals, such as sheep and horses, are produced in the same way.
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