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opsonize them. Macrophages have complement receptor 1 (CR1) and 3 (CR3) that recognize pathogen-bound complement proteins C3b and iC3b, respectively, as well as fragment crystallizable ? receptors (Fc?Rs) that recognize the fragment crystallizable (Fc) region of antigen-bound immunoglobulin G (IgG) antibodies. When phagocytosing and digesting pathogens, macrophages go through a respiratory burst where more

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