How does a proto-oncogene differ from an oncogene?

Answer:
Compare with a virus: dormant to active, potential to kinetic, potent(ial) to actual. The proto-oncogene may become a cancer-causing oncogene only under very specific conditions and may, under other conditions, just as well lay dormant.
First answer by Betaclamp. Last edit by Betaclamp. Contributor trust: 104 [recommend contributor recommended]. Question popularity: 1 [recommend question].