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Livestock research. Conceptual image of domesticated cows (Bos primigenius) in field marked with bar codes. This represents the tracking of individual cows for research purposes. The domesticated cow is reared its meat and milk. Bar codes are a machine-readable method of tagging and identifying products and objects. This image could represent genetically modified cows. (KEYSTONE/SCIENCE PHOTO LIBRARY/VICTOR DE SCHWANBERG)