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本帖最后由 nero1981 于 2012-3-23 10:57 编辑 % H5 ]3 {. Z+ N/ H
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4 _6 D7 ]! Q% o D7 d! pCOVER Spring sun lights up signaling pathways. In plants, the UVR8 protein senses ultraviolet-B (UV-B) wavelengths in sunlight, triggering changes in growth and development, including the production of a protective chemical sunscreen. Pyramids of tryptophan rings intrinsic to UVR8 create a built-in light switch; no separate chromophore is required. Understanding how plant growth varies with changes in sunlight becomes more important as we adapt to climate change. See page 1492. Photo: iStockphoto.com
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