A protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin. Antibodies destroy or weaken bacteria and neutralize organic poisons, thus forming the basis of immunity.

• 抗体，免疫体血液或组织针对某种抗原如细菌或毒素而产生的蛋白质物质。抗体消灭细菌或削弱其作用，中和有机毒素，因而形成免疫力