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· antibody, a protective protein produced by the immune system in response to the presence of a foreign … · the five antibody classes produced by the body include igg, igm, iga, igd, and ige. An antibody (ab), or immunoglobulin (ig), is a large, y-shaped protein belonging to the immunoglobulin superfamily which is … An antigen can be a … · an antibody is a protein produced by your immune system to attack and fight off these antigens. Igm is the first antibody … · an antibody is a protein that develops in response to a foreign invader (the antigen).