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( CD-31)
 If a neutrophil is dying, it will have phosphatidyl serine in its plasma membrane. Both the neutrophil and the macrophage express CD-31 on their membranes, and, during the testing process, these CD-31 molecules bind the two cells together. If the neutrophil is healthy, it will now fire a signal to the macrophage, and the CD-31 molecules will detach. The neutrophil is now free. If the neutrophil is not healthy, it will not be able to signal back to the macrophage to prevent its peril. This happens a long time before the neutrophil degrades and releases its dangerous payload to the medium. Macrophages normally release cytokines, when phagocytizing material. When eating a neutrophil, they do not release the cytokines. Neutrophils come of age 6 days after their creation. This signifies a strong turnover rate, one that is even stronger during and after inflammatory processes. It would make no sense to further stimulate the inflammation because of this event. Macrophages ingesting dying neutrophils will, however, release more TGF-Beta, further stimulating tissue repair. In humans, the gene encoding CD-31 is found on chromosome 17.
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