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What is a proto-oncogene?

What is a proto-oncogene? Here are some definitions.

Noun
  1. (genetics) A gene, that promotes the specialization and division of normal cells, that becomes an oncogene following mutation
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Examples
Though it normally help cells mature, c-jun can also act as a proto-oncogene, Timblin explains.
The Genentech researchers validated 392 somatic SNVs in coding regions, including one in the KRAS proto-oncogene.
Further investigation showed that the vector had inserted the gene near a proto-oncogene, which led to uncontrolled growth of the T cells. The clinical trials were put on hold until a safer method can be designed and tested.
The src gene, then, was really a cellular oncogene, or proto-oncogene.
A proto-oncogene may be converted into an oncogene through a single alteration of a nucleotide.
Proto-oncogene tyrosine-protein kinase 1. proto-oncogene B-Raf.

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