<prompt> Hemagglutinin Anti A and Anti B are which type of antibodies -Ig GIg MIg AIgE  <response>: IgM is a heavy molecule. - IgM molecules are polymers of five four-peptide subunits. the earliest immunoglobulin synthesized by the fetus. - the isohemagglutinins anti- A, anti - B and many other natural antibodies to microorganisms are usually IgM. ReReference:nathanarayan panikers 9th edition, pg no: 98 p 