text: The J chain is found in the A and M isotypes of these proteins which are a dimer and pentamer respectively.
full_question: The J chain is found in the A and M isotypes of these proteins which are a dimer and pentamer respectively. These proteins are used with enzymes in the ELISA ["eh-LIE-suh"] assay. The diversity of these proteins is increased by mechanisms like somatic hypermutation and V-D-J recombination. These proteins are used to visualize the results of a western blot. Hybridomas, which are derived from plasma cells, produce monoclonal varieties of these proteins which in the body they are typically polyclonal. These proteins consist of two heavy chains and two light chains. For 10 points, name these Y-shaped proteins produced by B cells which bind to antigens.
first_sentence: The J chain is found in the A and M isotypes of these proteins which are a dimer and pentamer respectively.
raw_answer: antibody [or immunoglobulins]