Or they can occur in proto-oncogenes, which normally code for proteins that promote the cell cycle - so they're the cell cycle's accelerator pedal.

基因突变也可以发生在原癌基因；原癌基因的功能是编码促进细胞周期运转的蛋白质，所以它算是细胞周期的“油门”。

If only one p53 gene in the pair is mutated, the other gene will still be able to control the cell cycle.

如果该对中只有一个P53基因发生突变，另一个基因仍能控制细胞周期。

Mutations can occur in tumor suppressor genes, which normally code for proteins that stop the cell cycle or promote apoptosis - so they're the cell cycle's very own brake pedal.

基因突变可能会发生在抑癌基因；抑癌基因的功能是编码、阻断细胞周期，或促进凋亡的蛋白质，所以它算是细胞周期的“刹车片”。