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The cell on the left is going through mitosis and its chromosomes have condensed. Cell nucleus: A cell's information center, the cell nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell's chromosomes, and is the place where almost all DNA replication and RNA synthesis (transcription) occur.
On a stained blood smear, platelets appear as dark purple spots, about 20% of the diameter of red blood cells. The smear reveals size, shape, qualitative number, and clumping . A healthy adult typically has 10 to 20 times more red blood cells than platelets.
During cancer T cell exhaustion plays a role in tumor protection. According to research some cancer-associated cells as well as tumor cells themselves can actively induce T cell exhaustion at the site of tumor. [84] [85] [86] T cell exhaustion can also play a role in cancer relapses as was shown on leukemia. [87]
The initial introduction of the character included the concepts of a soldier named Steve Rogers being given a serum bestowing enhanced strength and agility, wearing a patriotic red, white and blue uniform, carrying a shield, and having as a sidekick, a teenaged Bucky Barnes.
These large cells from the epidermis of a red onion are naturally pigmented. The epidermal cells of onions provide a protective layer against viruses and fungi that may harm the sensitive tissues. Because of their simple structure and transparency they are often used to introduce students to plant anatomy [ 1 ] or to demonstrate plasmolysis . [ 2 ]
In immunology, leukocyte extravasation (also commonly known as leukocyte adhesion cascade or diapedesis – the passage of cells through the intact vessel wall) is the movement of leukocytes (white blood cells) out of the circulatory system (extravasation) and towards the site of tissue damage or infection.
The loss of red blood cell elasticity is central to the pathophysiology of sickle cell disease. Normal red blood cells are quite elastic and have a biconcave disc shape, which allows the cells to deform to pass through capillaries. [75] In sickle cell disease, low oxygen tension promotes red blood cell sickling and repeated episodes of sickling ...
Artist's impression of Earth in the early Archean with a purplish hydrosphere and coastal regions Purple culture of Haloarchaea (left) and isolated purple and red membrane components (right) The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the ...
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