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.

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

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