Type of substance found on the surface of cells, particularly in the brain, that is important in cell-to-cell communication
One of the five classes of immunoglobulins ; widespread in the body, it provides long-lasting defense against most bacterial invasions and other antigens.
One of the five classes of immunoglobulins ; a large molecule, it is found in blood and is involved in combating blood infections. It is the first or primary immunoglobulin produced following exposure to an antigen.