, or immunoglobulins (Igs), produced by sensitized B cells and their
plasma cell offspring in response to an antigen, are a heterogeneous
group of proteins that comprise the general class of plasma proteins
called gamma globulins.
are found not only in plasma but also (to greater or lesser extents)
in all body secretions.
mayor classes of immunoglobulins have been identified: IgM, IgG, IgD,
IgA and IgG.
classes share a common basic structure but differ functionality and
in their localization in the body.