English: Depiction of how LPS (an example of a specific pathogen-associated molecular pattern or PAMP) is recognized by a pattern recognition receptor (PRR) on the surface of a macrophage. Binding of the PAMP to the PRR results in the eventual release of the cytokines IL-8, Il-1, and TNFα which allows for phagocytic neutrophils to enter from blood vessels into the affected tissue.