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Introduction to oncogens

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Please provide an explanation for the role of oncogenes.

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An oncogene is a gene that impacts the rate of cell growth and as such may lead a cell to become cancerous. Normal cells are transformed into tumor cells by genetic modifications resulting from mutations within specific genes, such as oncogenes and silenced tumor suppressor genes, or from chromosomal rearrangements. Sometimes mutations are accidental: when a cell replicates, part of the genetic code is 'misspelled'. At other times, environmental factors, such as chemicals, ...

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This answer provides an explanation about oncogenes and their role in carcinogenesis.