tokens: In this study , various sets of somatic cell hybrids , generated by the fusion of epithelial cell lines with B-lymphoblastoid cell lines , were analyzed for the expression of major histocompatibility complex ( MHC ) class II antigens .
folded_tokens: in this study , various sets of somatic cell hybrids , generated by the fusion of epithelial cell lines with b-lymphoblastoid cell lines , were analyzed for the expression of major histocompatibility complex ( mhc ) class ii antigens .
labels: O O O O O O O B-cell_line I-cell_line I-cell_line O O O O O O B-cell_line I-cell_line I-cell_line O B-cell_line I-cell_line I-cell_line O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O