Updated Sep 29, 2022 Immunoglobulins are protein molecules conferring antibody activity produced by terminal cells of B-cell differentiation known as plasma cells. Together, the B-cell immune lineage and their end-products, the immunoglobulins, are referred to as the humoral immune system to differentiate them from T cell-mediated immunity. There are five main classes of immunoglobulin (Ig) … Continue reading Serum Globulin