This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Following are required for normal growth 
Select and explain. 
A. Proto oncogene, B. Tumor suppressor genes, C. Oncogenes, D. DNA repair genes
A: Proto oncogene
Answer: A: Proto oncogene 
Explanation: A,B,D are answers Ref Robbins 7/e p290; 9/e 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.