Genetically Modified Trees

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October 12, 2007, Raleigh, NC.. The interior of the greenhouse. The experimental trees, mostly loblolly pine and black cottonwoods, are at various stages of growth, from a few weeks, to several months..Greenhouses at the Department of Forest Biotechnology at North Carolina State University are being used to grow trees with lower lignin levels to be better used for future bio-fuel technologies.