What do NK cells use to distinguish between self and nonself?

Name: What do NK cells use to distinguish between self and nonself?
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NK cells use MHC class I molecules to distinguish between self and nonself. Normal cells express MHC class I molecules on their surface, which NK cells recognize as "self" and do not attack. However, infected or cancerous cells often downregulate MHC class I expression, which makes them vulnerable to NK cell-mediated recognition and destruction.

What Do NK Cells Use to Distinguish Between Self and Nonself