For 10 points - name these proteins that are produced as a result of an antigenic stimulus.
The RAG-1 gene is expressed only in the stages when recombination is taking place in these molecules.  This discovery first grew out of Susumo Tonegawa's experiments on recombination's cause for their diversity.  They exist as two sets of polypeptides, each present in duplicate and divided into a variable and constant region, and with the larger termed the heavy chain and the smaller termed the light chain.  In humans, they are divided into five classes referred to as immunoglobulins.  For 10 points - name these proteins that are produced as a result of an antigenic stimulus.
The RAG-1 gene is expressed only in the stages when recombination is taking place in these molecules.  
antibody or antibodies (accept immunoglobulins before they're mentioned)