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D Nature's green plants often fight insects and other plant-eat- ers by releasing bitter chemicals into their leaves.If a plant tastes bad,hungry insects will avoid it.Plants make sacrifices to protect themselves from pests. Now a tiny weed that squeezes through sidewalk cracks is helping scientists understand those costs of always being on guard.In a new study,researchers studied Arabidopsis,the "lab rat"of the plant world,to learn what this bitter defense costs the plant. All plants have a series of what are called JAZ genes ( in their DNA,which provide the instructions to make JAZ pro- teins.These proteins help plants control how they use defensive