Immunoglobulin G (IgG), the most abundant type of antibody, is found in all body fluids and protects against bacterial and viral infections. Immunoglobulin M (IgM), which is found mainly in the blood and lymph fluid, is the first antibody to be made by the body to fight a new infection.
Ig A
There are five immunoglobulin classes (isotypes) of antibody molecules found in serum: IgG, IgM, IgA, IgE, and IgD. IgA (immunoglobulin A) IgD (immunoglobulin D) IgE (immunoglobulin E) IgG (immunoglobulin G) IgM (immunoglobulin M)
IgA, IgD, IgE, IgG and IgM (alpha, delta, epsilon, gamma and mu) IgD, IgE and IgG are monomers IgA has a monomer form as well as a dimmer composed of two conjoined monomers IgM is a pentamer composed of five monomers
"There are five classes of immunoglobulins IgA, IgD, IgE, IgG, and IgM." OR "This antibody, also called an immunoglobulin, may damage the nerve fibers"
Antibodies. For an naive B cell it is generally IgM and IgD. An activated B cell will express IgA, IgE or IgG after it goes through isotype switching.
IgA, IgG, IgE
I suppose calling such particles as immunoglobulin is not something very wrong. Five types of immunoglobulin are seen in our body, IGA IGE IGM IGD IGG .
An antigen isn't supposed to be in your body. That is what an antigen means. So, although there are likely many (bacteria, viruses, pollen, etc.), there is no set number.
1. IgA. It prevents pathogens from entering the body 2. IgD. Controls the B cell 3.IgE. Triggering allergic reactions 4. IgG. Activates complements, which are proteins in serum that attack pathogens 5. IgM. It also activates complements
IgE is the antibody that causes acute allergic reactions; it is measured to detect allergic conditions. IgD, which constitutes the smallest portion of the immunoglobulins, is rarely evaluated or detected, and its function is not well understood.
There are 5 main immunoglobulin isotypes (antibodies): IgM, IgD, IgG, IgE, IgA IgE antibodies will bind to mast cells and basophils and form cross-links when exposed to an allergen. Preformed histamine granules are released from the mast cells. This is the mechanism for type I hypersensitivity (i.e. asthma and allergies). wikipedia.org/wiki/Mast_cell Other antibodies provide different functions.
IgG and IgM can fix complement by activating the C3 protein at the end of the complement cascade allowing ADCC (antibody dependent cell- mediated cytoxicity) to occur. I have never heard of an IgC antibody. In humans there are only 5 classes of antibodies: IgM, IgG, IgA. IgD & IgE.