Not long after Calyxt moved into its shiny new steel and glass headquarters on the outskirts of Minneapolis last summer, a woman pulled her car into its freshly poured parking lot and headed for the biotech firm’s front door. She caught the company’s chief science officer, Dan Voytas, just as he was leaving. “Um, is this a medical marijuana facility?” she asked, here eyes drifting to the rows of greenhouses at the back of the property and the high fences surrounding them.

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