A mutagen is a chemical or physical agent capable of causing changes in DNA called mutations. Exposure to a mutagen can generate DNA mutations that cause or contribute to specific diseases. A mutagen is a chemical or physical agent that has the ability to change our hereditary code in a harmful way. The change in the hereditary code is called a mutation, and throughout our life time we really collect many mutations within our cells. If some of these mutations escape repair, they can cause a normal cell to be changed to become a tumor cell.
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