Here is described the five major classes of antibodies. They vary greatly in size and function. One thing to note is the table line “fixes complement”, essentially if the antibody is able to fix it complements it is binding the serum complement to the product of the resulting interaction of the antibody and its antigen. This, in turn, can result in lysing of the microbes that have entered the host, can also be called cell lysing. The body has many defence systems against antigens. One especially important molecule to antigen defence is antibodies. Due to their specificity as a result of being created specifically for individualized antigens, and their high affinity of binding they play an essential role in humoral affinity. However, their activity is not only related to binding of antigens, but they also are receptor molecules and in turn, promote a response that recruits immune cells for other effector functions of the immune system. There are various classes of antibodies that break down into smaller subclasses; the five main classes with diverse functions are presented: immunoglobulin (Ig)A, IgD, IgE, IgG, and IgM (Table 1). Despite the various classes of antibodies a majority of them are IgG’s, they constitute approximately 75% of the serum immunoglobulin repertoire. Within this class there are another four subclasses of IgG’s, these molecules vary in their abundance and the respective effector effect each invokes.
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