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Lymphocyte homing occurs in four steps leading to extravasation into target tissue; Rolling, activation, activation-dependent “arrest”, and diapedesis. [5] Mediated by lymphocyte receptors and vascular ligand interactions, “tethering” is a reversible linkage that leads to either rolling along the vessel wall or transient immediate arrest.
Codocytes, also known as target cells, are red blood cells that have the appearance of a shooting target with a bullseye. In optical microscopy these cells appear to have a dark center (a central, hemoglobinized area) surrounded by a white ring (an area of relative pallor), followed by dark outer (peripheral) second ring containing a band of ...
Neutrophils extravasate from blood vessels to the site of tissue injury or infection during the innate immune response.. 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 ...
L-selectin, also known as CD62L, is a cell adhesion molecule found on the cell surface of leukocytes, and the blastocyst.It is coded for in the human by the SELL gene. L-selectin belongs to the selectin family of proteins, which recognize sialylated carbohydrate groups containing a Sialyl LewisX (sLeX) determinant. [5]
In phase one, effector CTLs are generated from CTL precursors. The CTL precursors include naive T c cells since they are incapable of killing target cells. After a precursor cell has been activated, it can then differentiate into a functional CTL with cytotoxic activity. There are three sequential signals that are required to complete this process.
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