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Abstract
Neutrophils recognise humoral immunologic reactants through ‘receptors’ on their surface membrane. Most widely studied and probably of greatest biologic significance are the immunoglobulin (Fc), and complement (primarily C3b and C5a) receptors which enable the cell to react with, and be stimulated by, antigen-antibody, or antigen-antibody-complement complexes and their products. This interaction with the putative receptors and the consequent cell activation occurs most optimally on surfaces and plays a critical role in the mammalian host defense system.