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Impossible Burger's 'secret sauce' highlights challenges of food tech

A veggie burger from Impossible Foods. Impossible Foods says it has tested its ingredient on rats fed "well above" the amount of soy leghemoglobin in its burger.

New York

ONE of the chief selling points of the Impossible Burger, a much ballyhooed plant-based burger patty, is its resemblance to meat, right down to the taste and beeflike "blood." Those qualities, from an ingredient produced by a genetically engineered yeast, have made the burger a...

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