PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Cloning cows, nuclear transfer. Researcher using a mouth-operated pipette to manipulate eggs (female reproductive cells) during cloning work. The egg cells, in the petri dish, are observed using the microscope (top). The electrodes (at left) are used during the nuclear transfer process that creates a clone. These egg cells are from a cow (Bos taurus). This is the Bio Sidus biotechnology company, in Argentina, which successfully cloned a cow in 2002. The cloned cows are intended to be used to produce human growth hormone (hGH) in their milk.
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