<prompt> Following are required for normal growthProto oncogeneTumor suppressor genesOncogenesDNA repair genes  <response>: A,B,D are answers Ref Robbins 7e p290; 9e p280 A proto-oncogene is a normal gene that could become an oncogene due to mutations or increased expression. Proto-oncogenes code for proteins that help to regulate the cell growth and differentiation. Proto-oncogenes are often involved in signal transduction and execution of mitogenic signals, usually through their protein products. Examples of proto-oncogenes include RAS, WNT, MYC, ERK, and TRK. 