Long-term effect of GM crops serves up food for thought. (cover story)

Discusses the risks involved with genetically modified crops for human health and biodiversity. Need for more research to identify long-term problems; Comparison of such crops with traditionally cultivated ones; Views of Robert McKinney of the United States National Institutes of Health (NIH); Debate about whether current safeguards are adequate; Question of whether to label genetically modified foods; Monitoring strategies. INSET: Basic research holds key to weighing risks.