For cells of the innate immune system, each individual cell has multiple pattern recognition receptors, and can recognize many different pathogens. In contrast, cells of the adaptive immune system each express only a single antigen receptor, and have a single specificity for pathogen recognition.

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Cells of the innate immune system, such as macrophages and dendritic cells, have multiple pattern recognition receptors (PRRs) that allow them to recognize a wide range of pathogens. In contrast, cells of the adaptive immune system, such as B cells and T cells, each express a unique antigen receptor that is specific to a single antigen, providing a highly specific response to pathogens.

For Cells of the Innate Immune System, Each Individual Cell