Changes

Antibodies recognize and bind tightly to small molecules (peptide or carbohydrate) termed [[antigen]]s. Antigens may be free floating in the blood, or bound to the plasma membrane of a pathogen or presented at the surface by another immune cell. An antibody may directly neutralize a pathogen, mark a microbe for attack, or be used to bind to antigens presented by other cells for further immune stimulation.

Antibodies recognize and bind tightly to small molecules (peptide or carbohydrate) termed [[antigen]]s. Antigens may be free floating in the blood, or bound to the plasma membrane of a pathogen or presented at the surface by another immune cell. An antibody may directly neutralize a pathogen, mark a microbe for attack, or be used to bind to antigens presented by other cells for further immune stimulation.

   

   

==References==

==References==

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