For 10 points, name these structures that are produced by B cells, sometimes called immunoglobulins, and bind to antigens.
These structures can act as opsonins by binding to other molecules, making them easier to phagocytose. The A form is found in colostrums and breast milk, and transfusion reactions are mediated by the M form. Monoclonal ones may be used to treat cancers. These structures consist of two heavy chains and two light chains. For 10 points, name these structures that are produced by B cells, sometimes called immunoglobulins, and bind to antigens.
These structures can act as opsonins by binding to other molecules, making them easier to phagocytose.
{antibodies} [or {antibody}; accept {gamma globulins}; accept early {immunoglobulins}]