sentences:  To combat infection, the phagocytes facilitate many pattern recognition receptors (PRRs) to help recognize pathogen-associated molecular patterns (PAMPs) on the surface of pathogenic microorganisms.PAMPs all have the common features of being unique to a group of pathogens but invariant in their basic structure; and are essential for pathogenicity (ability of an organism to produce an infectious disease in another organism).Proteins involved in microbial pattern recognition include mannose receptor, complement receptors, DC-SIGN, Toll-like receptors(TLRs), the scavenger receptor, CD14, and Mac-1.