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What attracts leukocytes and antibodies to pathogens in the first place? They just bump into them. If secreted antibody is already present in the blood then complement system can be activated. What attracts CD4+ cells to professional antigen-presenting cells (APC)? APC release chemokines. All that is known is that this is a CC-type chemokine ...


When the radial immunodiffusion method is used to measure antigen concentrations in samples, a plate or slide is set up using agarose containing an antibody or antiserum. Holes are punched out of the agarose to form wells into which antigen is dispensed. The antigen diffuses out into the agarose and when the antigen/antibody ratio is favourable an ...

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