The cell that is NOT APC is "natural killer cells" (Option D).
A kind of immune cell that stimulates immunological responses by displaying antigens on its surface to other immune system cells. APCs are a kind of phagocyte. Also known as an antigen-presenting cell.
APC is an immune cell that recognizes, engulfs, and notifies the adaptive immune response about a pathogen. When a pathogen is discovered, these APCs phagocytose it and break down it, resulting in numerous distinct antigen fragments.
APC inhibits proliferation, promotes differentiation, enables apoptosis, and inhibits invasion and tumor growth by negatively modulating classical WNT signaling. APC further inhibits classical WNT signaling in the nucleus by interacting with and combatting -catenin.
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