tokens: Immunoglobulin molecules on the surface of a B lymphocyte are the endogenous "receptors" to which specific antigens bind .
folded_tokens: immunoglobulin molecules on the surface of a b lymphocyte are the endogenous "receptors" to which specific antigens bind .
labels: B-protein_family_or_group I-protein_family_or_group O O O O O B-cell_type I-cell_type O O O O O O O O O O