tokens: EL-4 cells were transfected with a plasmid containing the IL-2 promoter and enhancer region linked to the chloramphenicol acetyltransferase ( CAT ) reporter gene .
folded_tokens: el-4 cells were transfected with a plasmid containing the il-2 promoter and enhancer region linked to the chloramphenicol acetyltransferase ( cat ) reporter gene .
labels: B-cell_type I-cell_type O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O O O B-protein_molecule I-protein_molecule O B-protein_molecule O O O O