<prompt> Immunoglobulins are formed by?Plasma cellsT-cellsB-cellsMacrophages  <response>: Plasma cells are the antibody-secreting cells. On contact with its appropriate antigen, the mature B cell undergoes clonal proliferation. The majority of activated B cells are transformed into plasma cells and secrete antibodiesWhile plasma cell is the best antibody-producing cell, lymphocytes, lymphoblasts and transitional cells may also synthesise Ig to some extent. 