tokens: Retinoids , including all-trans-retinoic acid , its isomers , and fifty synthetic retinoids ( retinobenzoic acids ) , were tested for differentiation-inducing activity on human leukemia cell lines HL-60 and NB4 .
folded_tokens: retinoids , including all-trans-retinoic acid , its isomers , and fifty synthetic retinoids ( retinobenzoic acids ) , were tested for differentiation-inducing activity on human leukemia cell lines hl-60 and nb4 .
labels: B-other_organic_compound O O B-other_organic_compound I-other_organic_compound O O O O O O O B-other_organic_compound O O O O O O O O B-other_name I-other_name O B-cell_line I-cell_line I-cell_line I-cell_line B-cell_line O B-cell_line O