Immune system cells differentiate between self and foreign cells by their ______.

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Immune system cells recognize self from non-self cells through specific molecules on the cell surface known as markers. These markers, often proteins or glycoproteins, allow the immune system to distinguish between the body's own cells and foreign cells, preventing an immune response against self while enabling the identification and destruction of pathogens.

Immune System Cells Differentiate Between Self and Foreign Cells by Their