Antibody and the antibody-like T-cell receptor (TCR)
molecules recognize antigens and act as receptors to activate
the growth and functions of those cells that can elicit the
antigen-specific response.The soluble forms of antibody in
the blood, body fluids, or secreted across membranes protect
the body by inactivating and promoting the elimination of
toxins and microbes, especially when they are in the blood
(bacteremia, viremia).Although some molecules elicit only a limited antibody
response (carbohydrates and lipids), proteins and protein-
conjugated molecules (including carbohydrates) elicit a
more complete immune response that includes T cells.T cells continuously regulate the
entire system, maintaining a balance that normally mini-
mizes inflammation but still allows protection from normal
and pathogenic microbes.