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  2. Cell cycle checkpoint - Wikipedia

    en.wikipedia.org/wiki/Cell_cycle_checkpoint

    Chk1/2 phosphorylate cdc25 which, in addition to being inhibited, is also sequestered in the cytoplasm by the 14-3-3 proteins. 14-3-3 are upregulated by p53, which, as previously mentioned, is activated by Chk1 and ATM/ATR. p53 also transactivates p21, and both p21 and the 14-3-3 in turn inhibit cyclin B-cdc2 complexes through the ...

  3. Spindle checkpoint - Wikipedia

    en.wikipedia.org/wiki/Spindle_checkpoint

    The spindle checkpoint, also known as the metaphase-to-anaphase transition, the spindle assembly checkpoint (SAC), the metaphase checkpoint, or the mitotic checkpoint, is a cell cycle checkpoint during metaphase of mitosis or meiosis that prevents the separation of the duplicated chromosomes until each chromosome is properly attached to the ...

  4. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    Martha Bradley (fl. 1740s – 1755) was a British cookery book writer. Little is known about her life, except that she published the cookery book The British Housewife (pictured) in 1756 and worked as a cook for more than 30 years in the fashionable spa town of Bath, Somerset.

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  6. Security checkpoint - Wikipedia

    en.wikipedia.org/wiki/Security_checkpoint

    Iraq Army soldier mans a checkpoint during Operation Red Light II US Army tanks and Soviet tanks at Checkpoint Charlie, 1961. Though practices and enforcement vary, checkpoints have been used in: Airports and other transportation hubs across the world, including those managed by the TSA in the United States. Post World War II checkpoints in Germany

  7. Immune system - Wikipedia

    en.wikipedia.org/wiki/Immune_system

    A scanning electron microscope image of a single neutrophil (yellow/right), engulfing anthrax bacteria (orange/left) – scale bar is 5 μm (false color). The immune system is a network of biological systems that protects an organism from diseases.