Answer:

Neutrophils, monocytes, macrophages, eosinophils, basophils, mast cells, natural killer (NK) cells, complement proteins, and acute-phase reactants. All of these elements have germline-encoded receptors that recognize motifs commonly present on microbes.

Reference:  Rich RR, Fleisher TA, Shearer WT, et al: Clinical Immunology, Principles and Practice, 2nd ed. St. Louis, Mosby, 2001.

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