Threadless, which has long been the thinking person's purveyor of silly T-shirts, just ran a design contest with an anti-GMO theme. Artists submitted designs that conveyed a "no GMO" message, and 25 percent of profit from sales of the winning design will go to the Institute for Responsible Technology, which fights GMOs in the United States.

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Here are some of our favorite designs, and you can see the rest at the contest site.

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