In normal cells, p21 ACTS like a brake to block cell cycle progression in the event of DNA damage, preventing the cells from dividing and potentially becoming cancerous.
在正常的细胞中，如果DNA受损，p 21就会像刹车一样阻断细胞周期进程以防止细胞分裂和癌变。
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Throwing sulphur into the atmosphere could slow down the world's water cycle and do more damage to rainfall patterns than the global warming it aims to prevent.
The ubiquitin-conjugating pathway involves in numerous metabolic processes in cells, including DNA damage repair, cell cycle control, stress responses and so on.