Immunoglobulin G (IgG) is the most abundant immunoglobulin, and is one of the major activators of the complement pathway. An immunoglobulin (or antibody) is a protein which is involved in immune responses. Part of the IgG molecule is able to interact with lots of cells of the immune system, and so it has the ability to stimulate a very direct attack on anything that it recognises. IgG is also the only type of immunoglobulin that is transferred across the placenta from mother to foetus. This gives unborn children some protection from diseases to which they have not yet been exposed.
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