Testing of Chemicals for Their Cancer-Causing Ability
Strong evidence exists that a substantial proportion of all cancers are caused by chemicals in the environment called carcinogens. How can the thousands of chemicals released into the environment, such as pesticides, herbicides, hair dyes, cosmetics, food additives and the by-products of manufacturing processes, be tested for their carcinogenic activity? Testing in animals takes 2 to 3 years and may cost $100,000 or more for the testing of a single compound. Today a number of much less expensive, more rapid, and simpler tests have been devised. All are based on assaying the
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