Humoral immunity - Definition

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Humoral immunity, also known as the "antibody-mediated system", is a type of immunity composed of antibodies and an extra "complement" system. This aspect of the immune system functions by way of blood circulation via the white blood cells, essentially the B-cell lymphocytes. These have the ability to transform into plasmocytes in order to produce antibodies. Also called immunoglobins, antibodies are produced in the spleen or lymph nodes, and are composed of proteins that are transported in blood plasma.