Carcinogens are
chemical substances that modify
genome of
cells to promote
cancer transformation. Generally, the term refers to agents that have been
introduced by human means.
DDT,
benzene, kepone
?, EDB, and
Asbestos have all been
classified as carcinogenic.
Tobacco has also been identified as a rich
source of hundreds of carcinogens like 3,4-benzpiren.
see also toxicology
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