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Blueberry plant (Vaccinium sect. Cyanococcus) grown in a test tube as part of research into plant genetic diversity. Using DNA fingerprinting, researchers are identifying key traits in important agricultural plants, such as resistance to disease or drought. Breeding these resilient strains can safeguard against widespread devastation of crops. (KEYSTONE/SCIENCE PHOTO LIBRARY/Peggy Greb/US DEPARTMENT OF AGRICULTURE/SCIENCE PHOTO LIBRARY)