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22 With these findings, there is strong evidence that NK cells and macrophages work together to combat intracellular M

In the classical pathway involving Factor Associated Suicide/Fas ligand (Fas/FasL) signaling, the Fas receptor interacts with FasL, which is predominantly secreted by activated T cells, natural killer (NK) cells, and specific malignant tumor cells, via its extracellular domain

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The list of candidate signals will no doubt expand further, and a variety of non-peptide transmitters exist which have not been discussed, but which are strongly associated with these processes