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Calgene Inc. and the Pure Food CampaignEssay Preview: Calgene Inc. and the Pure Food CampaignReport this essayCALGENE INC. AND THE PURE FOOD CAMPAIGNOver the past decade, Calgene Inc. has invested $20 million in research to develop a rot-resistant tomato. Tomatoes make an enzyme called polygalacturonase (PG) that causes them to soften as they ripen. To.