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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The tumor suppressor protein p21 Waf1/Cip1 acts as an inhibitor of cell cycle progression.

肿瘤抑制蛋白p21 Waf1/Cip1可以作为细胞周期的抑制因子。

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Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the carboxy-terminus of human p21.

该单克隆抗体是由合成的人源的针对p 21蛋白羧基末端的肽段免疫动物生产的。

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P21 views all components as interconnected in the process of 21st century teaching and learning.

FORBES: Digital Classrooms: Is The Investment Paying Off?

The 4Cs emphasized by P21 are the framework of the modern, global workplace.

FORBES: Digital Classrooms: Is The Investment Paying Off?