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- FIGURE 14-2. Germline mutation in a tumor suppressor gene gives cells
- a "head start" in multistep carcinogenesis. Homozygous inactivation of
- the gene in an individual with an inherited mutation requires a single
- somatic hit. In a normal individual two hits in the same cell are
- required. In addition to point mutations, gross chromosomal mechanisms
- such as deletion or nondisjunction may be involved in somatic hits.
-